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0
Nila Karthika Sathish Kumar
11/12/2025
Physics
Waves GCSE PPT resource
79
•
11 Dec 2025
•
Nila Karthika Sathish Kumar
@nilakarthikasat
Waves are everywhere around us - from the sound of... Show more











This GCSE Physics guide covers everything you need to know about waves for your AQA exams. You'll explore three main areas that build on each other naturally.
First, you'll learn about waves in air, fluids and solids - including how transverse and longitudinal waves behave differently, wave properties like frequency and amplitude, and how sound waves work. Then you'll discover electromagnetic waves - from radio waves to X-rays, including how we use them in everyday life and how lenses work with light.
Finally, you'll study black body radiation - how objects emit and absorb infrared radiation, which explains everything from thermal cameras to why space is cold.
Quick tip: Waves transfer energy, not matter - remember this key concept and you'll understand most wave behaviour!

The course is organised into LearnIT! and KnowIT! sections that work together to build your understanding step by step.
LearnIT! sections introduce new concepts with clear explanations and diagrams. You'll start with the basics like what makes transverse waves different from longitudinal waves, then move on to more complex ideas like wave calculations and real-world applications.
KnowIT! sections help you practise and memorise the key facts you need for exams. These include important equations, definitions, and examples that commonly appear in test questions.
Study smart: Use the LearnIT! sections to understand concepts, then test yourself with KnowIT! sections to check you've got it sorted.

Think of transverse waves like a Mexican wave at a football stadium - people move up and down whilst the wave travels sideways around the stadium. In transverse waves, particles vibrate perpendicular (at 90°) to the direction the wave travels.
Longitudinal waves work more like a slinky spring being pushed and pulled. The particles vibrate parallel to the wave direction, creating areas of compression (squashed together) and rarefaction (spread apart).
Water waves, light waves, and vibrating guitar strings are all transverse waves. Sound waves and some earthquake waves are longitudinal. Remember: it's energy that moves from place to place, not the actual particles!
Memory trick: Transverse = across (like crossing the road), Longitudinal = along (like longitude lines on a map).

Every wave has four key properties you need to know. Wavelength (λ) is the distance between two identical points on consecutive waves - peak to peak or trough to trough. Amplitude measures how far particles move from their resting position.
Frequency tells you how many complete waves pass a point each second (measured in Hz). Period is the time for one complete wave to pass (measured in seconds).
For longitudinal waves, instead of peaks and troughs, you get compressions (where particles are squashed together) and rarefactions (where particles are spread apart). The wavelength is still measured from compression to compression.
Exam focus: You'll definitely need to identify these properties on wave diagrams, so practise labelling them!

The wave equation is your most important tool: wave speed = frequency × wavelength . This works for all waves, from sound to light to water ripples.
You also need the period equation: period = 1/frequency . If a wave has a frequency of 0.5 Hz, its period is 1/0.5 = 2 seconds.
Let's try an example: a wave with frequency 0.5 Hz and wavelength 6 cm (0.06 m). Wave speed = 0.5 × 0.06 = 0.03 m/s. The period = 1/0.5 = 2 seconds.
Calculator tip: Always convert measurements to metres and seconds before calculating - it'll save you marks in exams!

You can measure sound speed using a simple method with a cannon and stopwatch. Stand 100m away from a cannon - when it fires, you see the flash instantly but hear the sound later.
If the sound takes 0.3 seconds to reach you, then: speed = distance/time = 100/0.3 = 333 m/s. This is roughly the speed of sound in air.
In the lab, you'd use two microphones placed a known distance apart. A loudspeaker makes a sound, and you measure how long it takes to travel between the microphones. Same calculation, just more precise!
Real-world connection: This is why you see lightning before hearing thunder - light travels much faster than sound!

A ripple tank lets you create and study water waves in the lab. An oscillating paddle creates regular waves, while a strobe light flashing at the same frequency makes the waves appear to stand still.
You measure the wavelength by using a ruler to find the distance between wave peaks (those bright lines you see). Then use the wave equation: speed = frequency × wavelength.
For example, if your paddle creates waves at 5 Hz and you measure a wavelength of 0.6 cm (0.006 m): wave speed = 5 × 0.006 = 0.03 m/s.
Practical tip: Make sure your strobe frequency exactly matches the wave frequency, or the waves will appear to move slowly!

When sound travels from air into water, something interesting happens. The frequency stays exactly the same because it depends on the source (like a vibrating speaker), not the medium.
However, sound travels much faster in water than air. Since speed increases but frequency stays constant, the wavelength must increase to keep the wave equation balanced.
Example: a 260 Hz sound travels at 330 m/s in air and 1500 m/s in water. Wavelength in air = 330/260 = 1.27 m. Wavelength in water = 1500/260 = 5.77 m - much longer!
Key insight: Frequency is like a wave's fingerprint - it never changes, no matter what medium the wave travels through.

When waves hit a boundary, three things can happen: reflection (bouncing back), absorption (energy turns to heat), or transmission (passing through).
For reflection, there's a simple rule: angle of incidence = angle of reflection. Both angles are measured from the normal (an imaginary line perpendicular to the surface).
This works for all waves - sound bouncing off walls (creating echoes), light reflecting from mirrors, or water waves bouncing off harbour walls. The smoother the surface, the better the reflection.
Exam trick: Always draw your angles from the normal line, not from the surface itself - it's a common mistake that loses marks!

Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
Nila Karthika Sathish Kumar
@nilakarthikasat
Waves are everywhere around us - from the sound of your voice to the light from your phone screen, and even the ripples you see when you drop a stone in water. Understanding how waves work will help you make... Show more

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This GCSE Physics guide covers everything you need to know about waves for your AQA exams. You'll explore three main areas that build on each other naturally.
First, you'll learn about waves in air, fluids and solids - including how transverse and longitudinal waves behave differently, wave properties like frequency and amplitude, and how sound waves work. Then you'll discover electromagnetic waves - from radio waves to X-rays, including how we use them in everyday life and how lenses work with light.
Finally, you'll study black body radiation - how objects emit and absorb infrared radiation, which explains everything from thermal cameras to why space is cold.
Quick tip: Waves transfer energy, not matter - remember this key concept and you'll understand most wave behaviour!

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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
The course is organised into LearnIT! and KnowIT! sections that work together to build your understanding step by step.
LearnIT! sections introduce new concepts with clear explanations and diagrams. You'll start with the basics like what makes transverse waves different from longitudinal waves, then move on to more complex ideas like wave calculations and real-world applications.
KnowIT! sections help you practise and memorise the key facts you need for exams. These include important equations, definitions, and examples that commonly appear in test questions.
Study smart: Use the LearnIT! sections to understand concepts, then test yourself with KnowIT! sections to check you've got it sorted.

Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Think of transverse waves like a Mexican wave at a football stadium - people move up and down whilst the wave travels sideways around the stadium. In transverse waves, particles vibrate perpendicular (at 90°) to the direction the wave travels.
Longitudinal waves work more like a slinky spring being pushed and pulled. The particles vibrate parallel to the wave direction, creating areas of compression (squashed together) and rarefaction (spread apart).
Water waves, light waves, and vibrating guitar strings are all transverse waves. Sound waves and some earthquake waves are longitudinal. Remember: it's energy that moves from place to place, not the actual particles!
Memory trick: Transverse = across (like crossing the road), Longitudinal = along (like longitude lines on a map).

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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Every wave has four key properties you need to know. Wavelength (λ) is the distance between two identical points on consecutive waves - peak to peak or trough to trough. Amplitude measures how far particles move from their resting position.
Frequency tells you how many complete waves pass a point each second (measured in Hz). Period is the time for one complete wave to pass (measured in seconds).
For longitudinal waves, instead of peaks and troughs, you get compressions (where particles are squashed together) and rarefactions (where particles are spread apart). The wavelength is still measured from compression to compression.
Exam focus: You'll definitely need to identify these properties on wave diagrams, so practise labelling them!

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The wave equation is your most important tool: wave speed = frequency × wavelength . This works for all waves, from sound to light to water ripples.
You also need the period equation: period = 1/frequency . If a wave has a frequency of 0.5 Hz, its period is 1/0.5 = 2 seconds.
Let's try an example: a wave with frequency 0.5 Hz and wavelength 6 cm (0.06 m). Wave speed = 0.5 × 0.06 = 0.03 m/s. The period = 1/0.5 = 2 seconds.
Calculator tip: Always convert measurements to metres and seconds before calculating - it'll save you marks in exams!

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Join milions of students
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You can measure sound speed using a simple method with a cannon and stopwatch. Stand 100m away from a cannon - when it fires, you see the flash instantly but hear the sound later.
If the sound takes 0.3 seconds to reach you, then: speed = distance/time = 100/0.3 = 333 m/s. This is roughly the speed of sound in air.
In the lab, you'd use two microphones placed a known distance apart. A loudspeaker makes a sound, and you measure how long it takes to travel between the microphones. Same calculation, just more precise!
Real-world connection: This is why you see lightning before hearing thunder - light travels much faster than sound!

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A ripple tank lets you create and study water waves in the lab. An oscillating paddle creates regular waves, while a strobe light flashing at the same frequency makes the waves appear to stand still.
You measure the wavelength by using a ruler to find the distance between wave peaks (those bright lines you see). Then use the wave equation: speed = frequency × wavelength.
For example, if your paddle creates waves at 5 Hz and you measure a wavelength of 0.6 cm (0.006 m): wave speed = 5 × 0.006 = 0.03 m/s.
Practical tip: Make sure your strobe frequency exactly matches the wave frequency, or the waves will appear to move slowly!

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When sound travels from air into water, something interesting happens. The frequency stays exactly the same because it depends on the source (like a vibrating speaker), not the medium.
However, sound travels much faster in water than air. Since speed increases but frequency stays constant, the wavelength must increase to keep the wave equation balanced.
Example: a 260 Hz sound travels at 330 m/s in air and 1500 m/s in water. Wavelength in air = 330/260 = 1.27 m. Wavelength in water = 1500/260 = 5.77 m - much longer!
Key insight: Frequency is like a wave's fingerprint - it never changes, no matter what medium the wave travels through.

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When waves hit a boundary, three things can happen: reflection (bouncing back), absorption (energy turns to heat), or transmission (passing through).
For reflection, there's a simple rule: angle of incidence = angle of reflection. Both angles are measured from the normal (an imaginary line perpendicular to the surface).
This works for all waves - sound bouncing off walls (creating echoes), light reflecting from mirrors, or water waves bouncing off harbour walls. The smoother the surface, the better the reflection.
Exam trick: Always draw your angles from the normal line, not from the surface itself - it's a common mistake that loses marks!

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Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Explore the properties of transverse waves, including light behavior, reflection, and refraction. This summary covers key concepts such as amplitude, wave interference, and the speed of light, providing essential insights for KS3 students. Understand how light travels, reflects, and refracts through different mediums with clear diagrams and explanations.
Explore the fundamental concepts of waves in this comprehensive booklet. Covering topics such as wave speed, types of waves, the electromagnetic spectrum, and practical applications of ultrasound and X-rays, this resource is designed to enhance your understanding and performance in Physics. Ideal for exam preparation with past paper questions and mark schemes included.
Explore the fundamental concepts of light, including reflection, refraction, and dispersion. This summary covers the behavior of light waves, the visible spectrum, and how we perceive colors. Ideal for students studying optics and light energy transformations.
Explore the essential concepts of light, including the Electromagnetic Spectrum, refraction, reflection, and the anatomy of the human eye. This summary provides clear insights into how light interacts with different materials, the structure of lenses, and the processes of total internal reflection and dispersion. Ideal for students preparing for exams or seeking to deepen their understanding of light. Type: Summary.
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user