Waves are everywhere - from the light you see to...
Physics163 views·Updated Jun 2, 2026·2 pagesUnderstanding Waves - GCSE Combined Science Higher (Part 1)
✨Pabs✨@pabs_loveprada
1
of 2
The Electromagnetic Spectrum and Wave Basics
The electromagnetic spectrum is like nature's ultimate playlist - it includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. What's brilliant is that they're all essentially the same thing, just with different wavelengths and frequencies.
Here's what makes waves special: they transfer energy without transferring matter. Think of it like a Mexican wave at a football stadium - the wave moves around the stadium, but each person stays in their seat. The particles in the medium vibrate and pass energy along, but they don't actually travel with the wave.
Transverse waves have oscillations perpendicular to the direction of energy transfer (like electromagnetic waves and water ripples), whilst longitudinal waves have oscillations parallel to the energy direction (like sound waves). The key equation you need to remember is v = fλ .
Quick Tip: All electromagnetic waves travel at the same speed through air or vacuum - that's the speed of light at 3 × 10⁸ m/s!
2
of 2
Refraction - When Waves Change Direction
Refraction happens when waves change speed as they move between different materials, causing them to bend. It's why a straw looks bent in a glass of water or why swimming pools appear shallower than they actually are.
The optical density of a material determines how quickly light can travel through it. When light moves from a less dense material (like air) into a denser one (like glass), it slows down and bends towards the normal. When it speeds up going the other way, it bends away from the normal.
Here's the crucial bit: when waves refract, their frequency stays constant but their wavelength changes. The wave fronts get closer together when the wave slows down, showing the change in velocity and wavelength.
Remember: If a wave hits the boundary straight on (along the normal), it changes speed but doesn't change direction - no refraction occurs!
We thought you’d never ask...
What is the Knowunity AI companion?
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.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content: Refraction
2PhysicsPhysics Concepts Overview
Explore essential physics concepts including states of matter, phase changes, energy sources, wave properties, and heat transfer. This comprehensive summary covers key principles such as Archimedes' principle, Ohm's law, and the laws of reflection and refraction, making it an invaluable resource for Year 9 students preparing for exams. Ideal for quick revision and understanding of fundamental physics topics.
931919
Physicselectromagnetic waves
yo
10570
Most popular content in Physics
9PhysicsForces and Motion Overview
Explore key concepts in Forces and Motion, including Hooke's Law, velocity, acceleration, and the principles of moments. This summary covers essential topics such as the relationship between force and extension, terminal velocity, and the impact of safety devices in physics. Ideal for AQA Physics Unit 5 revision.
109,158871
G
PhysicsGCSE Physics - Energy stores and Systems
Pl-Energy topic to revise for GCSE
101,3082
PhysicsPhysics Paper 2 Essentials
Master key concepts for AQA Combined Physics Paper 2, including electromagnetic waves, mechanics, forces, and motion. This comprehensive summary covers essential topics like wave properties, Newton's laws, and the motor effect, ensuring you're well-prepared for your exam.
1116,064940
C
PhysicsConservation of energy- energy types and stores
Build a strong foundation in physics with these easy flashcards covering key concepts and principles.
95991
PhysicsGCSE Physics Practical Experiments
Explore essential GCSE Physics practicals for AQA, covering key concepts such as Hooke's Law, wave properties, thermal insulation, and electrical circuits. This comprehensive guide includes step-by-step procedures, variables, and safety considerations for each experiment, ensuring a thorough understanding of practical applications in physics.
1011,404477
P
PhysicsPhysics Made Easy: Essential Concepts for Grade 10 Students
Master the fundamentals of physics with this comprehensive flashcard set designed specifically for grade 10 students. Learn key concepts and principles in an easy and engaging way!
104491
P
Physicsphysics equations Paper 1
quick key active recall of physics equations you need to learn for the GCSEs. many questions use to equations in one question in the paper therefore knowing all is beneficial. here the quiz teaches you about the units and the formula for the equations.
116833
ChemistryBTEC Applied Science Unit 1 Overview
Comprehensive resource for Year 12 students pursuing a Level 3 Diploma in Applied Science. This booklet covers essential topics including cell structure, chemical properties, and wave theory, providing clear explanations and key concepts to aid in your studies and exam preparation.
125,348122
P
PhysicsPhysics Quiz - Current, Charge and Power
AQA physics quiz.
111,0142
Most popular content
9
SociologySociology of Education Overview
Explore comprehensive A-Level Sociology notes on the education system, covering key theories, policies, and sociological perspectives. This resource includes insights on marketisation, gender roles, cultural deprivation, and educational inequalities, providing a thorough understanding of how education shapes social stratification and individual achievement. Ideal for exam preparation and in-depth study.
12102,8093,040
SociologySociology of Families: Comprehensive Revision
Dive into an extensive overview of family dynamics, perspectives, and patterns in sociology. This resource covers key concepts such as family diversity, gender roles, marriage, and the impact of social policies on family structures. Perfect for A-Level Sociology students preparing for Paper 2.
1273,5592,306
CriminologyCriminology: Crime & Punishment Overview
Comprehensive mindmaps covering key concepts in the Crime and Punishment topic for WJEC Criminology Unit 4. This resource includes detailed insights into the Criminal Justice System, crime prevention strategies, sentencing models, and the roles of various agencies. Ideal for A-Level revision, ensuring you grasp essential theories and legislative processes to excel in your exams.
1254,8531,059
SociologyComprehensive Crime & Deviance Overview
Explore an extensive revision of crime and deviance topics, including theories, types of crime, and the impact of media. This resource covers key concepts such as Marxism, functionalism, gender and crime, and the influence of globalization on criminal behavior. Ideal for students seeking a thorough understanding of criminology and its various theories. Type: Full Topic Revision.
1251,6311,399
English LiteratureAn Inspector Calls: Character Insights
Explore in-depth analysis and key quotes for characters in J.B. Priestley's 'An Inspector Calls'. This resource covers Gerald Croft, Inspector Goole, Sheila Birling, Mrs. Birling, Eric Birling, and Eva Smith, focusing on themes of class, gender roles, and social responsibility. Ideal for students aiming for Grade 8 and above.
1025,412907
CriminologyWJEC Unit 4 Criminology
Criminology unit 4 detailed revision note
127,146125
C
BiologyCell Biology and Cell structure
cell structures
93,1870
CriminologyCriminology Theories Overview
Explore key criminology theories and their implications on crime and deviance. This comprehensive summary covers biological, psychological, and sociological perspectives, including labelling theory, right realism, and the impact of social campaigns on policy development. Ideal for A-Level criminology students seeking to understand the complexities of criminal behaviour and the factors influencing crime prevention strategies.
129,754210
English LiteratureRomeo and Juliet: Key themes
Key Romeo and Juliet themes and analysed quotes
106,695198
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5App Store
4.7/5Google Play
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 SiOS 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 KlichAndroid 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.
AnnaiOS user
Physics163 views·Updated Jun 2, 2026·2 pagesUnderstanding Waves - GCSE Combined Science Higher (Part 1)
✨Pabs✨@pabs_loveprada
Waves are everywhere - from the light you see to the sound you hear to the radio waves your phone uses. Understanding how these energy carriers behave when they hit different materials is crucial for explaining everything from why objects...
1
of 2
Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
The Electromagnetic Spectrum and Wave Basics
The electromagnetic spectrum is like nature's ultimate playlist - it includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. What's brilliant is that they're all essentially the same thing, just with different wavelengths and frequencies.
Here's what makes waves special: they transfer energy without transferring matter. Think of it like a Mexican wave at a football stadium - the wave moves around the stadium, but each person stays in their seat. The particles in the medium vibrate and pass energy along, but they don't actually travel with the wave.
Transverse waves have oscillations perpendicular to the direction of energy transfer (like electromagnetic waves and water ripples), whilst longitudinal waves have oscillations parallel to the energy direction (like sound waves). The key equation you need to remember is v = fλ .
Quick Tip: All electromagnetic waves travel at the same speed through air or vacuum - that's the speed of light at 3 × 10⁸ m/s!
2
of 2Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Refraction - When Waves Change Direction
Refraction happens when waves change speed as they move between different materials, causing them to bend. It's why a straw looks bent in a glass of water or why swimming pools appear shallower than they actually are.
The optical density of a material determines how quickly light can travel through it. When light moves from a less dense material (like air) into a denser one (like glass), it slows down and bends towards the normal. When it speeds up going the other way, it bends away from the normal.
Here's the crucial bit: when waves refract, their frequency stays constant but their wavelength changes. The wave fronts get closer together when the wave slows down, showing the change in velocity and wavelength.
Remember: If a wave hits the boundary straight on (along the normal), it changes speed but doesn't change direction - no refraction occurs!
We thought you’d never ask...
What is the Knowunity AI companion?
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.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content: Refraction
2PhysicsPhysics Concepts Overview
Explore essential physics concepts including states of matter, phase changes, energy sources, wave properties, and heat transfer. This comprehensive summary covers key principles such as Archimedes' principle, Ohm's law, and the laws of reflection and refraction, making it an invaluable resource for Year 9 students preparing for exams. Ideal for quick revision and understanding of fundamental physics topics.
931919
Physicselectromagnetic waves
yo
10570
Most popular content in Physics
9PhysicsForces and Motion Overview
Explore key concepts in Forces and Motion, including Hooke's Law, velocity, acceleration, and the principles of moments. This summary covers essential topics such as the relationship between force and extension, terminal velocity, and the impact of safety devices in physics. Ideal for AQA Physics Unit 5 revision.
109,158871
G
PhysicsGCSE Physics - Energy stores and Systems
Pl-Energy topic to revise for GCSE
101,3082
PhysicsPhysics Paper 2 Essentials
Master key concepts for AQA Combined Physics Paper 2, including electromagnetic waves, mechanics, forces, and motion. This comprehensive summary covers essential topics like wave properties, Newton's laws, and the motor effect, ensuring you're well-prepared for your exam.
1116,064940
C
PhysicsConservation of energy- energy types and stores
Build a strong foundation in physics with these easy flashcards covering key concepts and principles.
95991
PhysicsGCSE Physics Practical Experiments
Explore essential GCSE Physics practicals for AQA, covering key concepts such as Hooke's Law, wave properties, thermal insulation, and electrical circuits. This comprehensive guide includes step-by-step procedures, variables, and safety considerations for each experiment, ensuring a thorough understanding of practical applications in physics.
1011,404477
P
PhysicsPhysics Made Easy: Essential Concepts for Grade 10 Students
Master the fundamentals of physics with this comprehensive flashcard set designed specifically for grade 10 students. Learn key concepts and principles in an easy and engaging way!
104491
P
Physicsphysics equations Paper 1
quick key active recall of physics equations you need to learn for the GCSEs. many questions use to equations in one question in the paper therefore knowing all is beneficial. here the quiz teaches you about the units and the formula for the equations.
116833
ChemistryBTEC Applied Science Unit 1 Overview
Comprehensive resource for Year 12 students pursuing a Level 3 Diploma in Applied Science. This booklet covers essential topics including cell structure, chemical properties, and wave theory, providing clear explanations and key concepts to aid in your studies and exam preparation.
125,348122
P
PhysicsPhysics Quiz - Current, Charge and Power
AQA physics quiz.
111,0142
Most popular content
9SociologySociology of Education Overview
Explore comprehensive A-Level Sociology notes on the education system, covering key theories, policies, and sociological perspectives. This resource includes insights on marketisation, gender roles, cultural deprivation, and educational inequalities, providing a thorough understanding of how education shapes social stratification and individual achievement. Ideal for exam preparation and in-depth study.
12102,8093,040
SociologySociology of Families: Comprehensive Revision
Dive into an extensive overview of family dynamics, perspectives, and patterns in sociology. This resource covers key concepts such as family diversity, gender roles, marriage, and the impact of social policies on family structures. Perfect for A-Level Sociology students preparing for Paper 2.
1273,5592,306
CriminologyCriminology: Crime & Punishment Overview
Comprehensive mindmaps covering key concepts in the Crime and Punishment topic for WJEC Criminology Unit 4. This resource includes detailed insights into the Criminal Justice System, crime prevention strategies, sentencing models, and the roles of various agencies. Ideal for A-Level revision, ensuring you grasp essential theories and legislative processes to excel in your exams.
1254,8531,059
SociologyComprehensive Crime & Deviance Overview
Explore an extensive revision of crime and deviance topics, including theories, types of crime, and the impact of media. This resource covers key concepts such as Marxism, functionalism, gender and crime, and the influence of globalization on criminal behavior. Ideal for students seeking a thorough understanding of criminology and its various theories. Type: Full Topic Revision.
1251,6311,399
English LiteratureAn Inspector Calls: Character Insights
Explore in-depth analysis and key quotes for characters in J.B. Priestley's 'An Inspector Calls'. This resource covers Gerald Croft, Inspector Goole, Sheila Birling, Mrs. Birling, Eric Birling, and Eva Smith, focusing on themes of class, gender roles, and social responsibility. Ideal for students aiming for Grade 8 and above.
1025,412907
CriminologyWJEC Unit 4 Criminology
Criminology unit 4 detailed revision note
127,146125
C
BiologyCell Biology and Cell structure
cell structures
93,1870
CriminologyCriminology Theories Overview
Explore key criminology theories and their implications on crime and deviance. This comprehensive summary covers biological, psychological, and sociological perspectives, including labelling theory, right realism, and the impact of social campaigns on policy development. Ideal for A-Level criminology students seeking to understand the complexities of criminal behaviour and the factors influencing crime prevention strategies.
129,754210
English LiteratureRomeo and Juliet: Key themes
Key Romeo and Juliet themes and analysed quotes
106,695198
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5App Store
4.7/5Google Play
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 SiOS 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 KlichAndroid 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.
AnnaiOS user