Waves are everywhere around us - from the light you...
Physics90 views·Updated 27 Aug 2026·3 pagesUnderstanding the Electromagnetic Spectrum and Wavelengths
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Clara@s_clara
1 / 3
1
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Wave Basics and the Electromagnetic Spectrum
Ever wondered how your mobile gets a signal or how you can see colours? It's all about waves! The most important thing to remember is that waves transfer energy and information without moving matter from one place to another.
There are two main types of waves you need to know. Transverse waves have vibrations that are perpendicular (at right angles) to the direction the wave travels - think of light waves. Longitudinal waves have vibrations parallel to the direction of travel - sound waves are a perfect example.
The electromagnetic spectrum includes radio waves, infrared, ultraviolet, X-rays, and gamma rays. Each type has different wavelengths and uses - radio waves for communication, X-rays for medical imaging. Sound waves are different though - humans can only hear frequencies between 20Hz and 20,000Hz.
Quick Tip: Remember that all waves can be reflected (like an echo) or refracted (bent when they change medium).
2
of 3
Wave Calculations and Key Formulas
You'll definitely need these three essential formulas for your exams! Speed = distance ÷ time is the basic one you probably know already. Frequency = 1 ÷ time period tells you how many vibrations happen per second. The big one is wave speed = frequency × wavelength .
When answering exam questions, always identify whether you're dealing with a transverse or longitudinal wave first. Light is transverse, sound is longitudinal - that's the easy way to remember it. Frequency measures vibrations per second, and it's measured in Hertz (Hz).
Don't forget your units! Wavelength is in metres , speed in metres per second (m/s), and frequency in Hertz (Hz). Getting the units wrong will cost you marks even if your calculation is spot on.
Exam Success: Always write down the formula first, then substitute your values - examiners love to see your working!
3
of 3
Solving Wave Problems Like a Pro
Let's tackle some real frequency calculations that often appear in exams. When you know the time period, use f = 1/t. For example, if a wave has a time period of 0.25 seconds, the frequency is 1 ÷ 0.25 = 4 Hz. This means the wave vibrates 4 times every second!
For trickier problems involving wave speed, rearrange v = fλ to find what you need. If a sound wave travels at 340 m/s with a wavelength of 0.85m, then frequency = 340 ÷ 0.85 = 400 Hz. That's 400 vibrations per second - quite fast!
Remember these essential units for physics: mass in kilograms (kg), distance in metres , force in Newtons (N), and angles in degrees (°). Getting familiar with these now will make all your physics calculations much easier.
Top Tip: Practice rearranging the wave equation - you might need to find wavelength or speed instead of frequency!
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Physics90 views·Updated 27 Aug 2026·3 pagesUnderstanding the Electromagnetic Spectrum and Wavelengths
C
Clara@s_clara
Waves are everywhere around us - from the light you see to the sound you hear! Understanding how waves work and the key formulas for calculating their properties is essential for your physics GCSE.
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Wave Basics and the Electromagnetic Spectrum
Ever wondered how your mobile gets a signal or how you can see colours? It's all about waves! The most important thing to remember is that waves transfer energy and information without moving matter from one place to another.
There are two main types of waves you need to know. Transverse waves have vibrations that are perpendicular (at right angles) to the direction the wave travels - think of light waves. Longitudinal waves have vibrations parallel to the direction of travel - sound waves are a perfect example.
The electromagnetic spectrum includes radio waves, infrared, ultraviolet, X-rays, and gamma rays. Each type has different wavelengths and uses - radio waves for communication, X-rays for medical imaging. Sound waves are different though - humans can only hear frequencies between 20Hz and 20,000Hz.
Quick Tip: Remember that all waves can be reflected (like an echo) or refracted (bent when they change medium).
2
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Wave Calculations and Key Formulas
You'll definitely need these three essential formulas for your exams! Speed = distance ÷ time is the basic one you probably know already. Frequency = 1 ÷ time period tells you how many vibrations happen per second. The big one is wave speed = frequency × wavelength .
When answering exam questions, always identify whether you're dealing with a transverse or longitudinal wave first. Light is transverse, sound is longitudinal - that's the easy way to remember it. Frequency measures vibrations per second, and it's measured in Hertz (Hz).
Don't forget your units! Wavelength is in metres , speed in metres per second (m/s), and frequency in Hertz (Hz). Getting the units wrong will cost you marks even if your calculation is spot on.
Exam Success: Always write down the formula first, then substitute your values - examiners love to see your working!
3
of 3Sign up to see the content. It's free!
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Solving Wave Problems Like a Pro
Let's tackle some real frequency calculations that often appear in exams. When you know the time period, use f = 1/t. For example, if a wave has a time period of 0.25 seconds, the frequency is 1 ÷ 0.25 = 4 Hz. This means the wave vibrates 4 times every second!
For trickier problems involving wave speed, rearrange v = fλ to find what you need. If a sound wave travels at 340 m/s with a wavelength of 0.85m, then frequency = 340 ÷ 0.85 = 400 Hz. That's 400 vibrations per second - quite fast!
Remember these essential units for physics: mass in kilograms (kg), distance in metres , force in Newtons (N), and angles in degrees (°). Getting familiar with these now will make all your physics calculations much easier.
Top Tip: Practice rearranging the wave equation - you might need to find wavelength or speed instead of frequency!
We thought you’d never ask...
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.
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