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Types of Energy School Physics revision notes: (i) Sound energy and energy transfers

GCSE level Physics exam revision notes: Types of energy

Sound energy defined and examples energy transfers involving sound explained

[Author © Dr Phil Brown PhD: Doc Brown's physics exam revision notes suitable for students of UK IGCSE & GCSE level physics courses, ~ US grades 9-10 physics [energy-0 page updated Mar 6th 2026 *]

[KEY POINTS and learning objectives for this page, after initial notes]

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ENERGY INDEX: Types of energy & energy stores, energy transfers & selected energy calculations

(i) Sound energy

This page will help you answer questions such as ...  How is sound energy produced?  Can you store sound energy?

Index of types of energy stores/transfers

Sound energy and energy transfers involving sound waves

Technically sound is not an energy store, but an important form of energy transfer

  • Sound is caused by any material object vibrating (piano strings, vocal chords) or any vibrations in a material (earthquake waves in the Earth's crust) - its all the same really!

  • This is energy carried by the vibrations of sound waves in a medium usually air, but can be liquids like water or solids like iron.

  • Noise from loudspeakers, squealing brakes of a car, using your vocal chords!

  • Useful as it is, you cannot store sound energy as the vibration energy is always dissipated to the surroundings - usually increasing the thermal energy store of anything the sound waves impact on (absorption) and the surroundings.- therefore In most cases the energy from sound waves increases the thermal energy stores of these materials.

  • You cannot store sound energy, but you can create from another energy store via some energy transfer e.g. electrical energy to sound via a loudspeaker.

  • See Sound waves - properties explained, uses of sound including ultrasound for all the details

Extended Key points for Physics - sound energy transfer via sound waves

Information sources for Doc Brown's key points: IGCSE-GCSE physics are based on textbooks & syllabus-specifications for students taking the UK AQA, Edexcel, OCR 21st Century Science, OCR Gateway science suite, WJEC, CCEA & CIE GCSE physics 9-1 level science examinations.

Here's a detailed, syllabus-aligned revision guide on Sound Energy, tailored for GCSE/IGCSE Physics students across WJEC, CCEA, CIE, AQA, Edexcel, and OCR exam boards:

Sound Energy – GCSE Physics Revision Notes

What is Sound Energy?

  • Sound energy is the energy carried by vibrating particles in a medium (solid, liquid, or gas).
  • It is a form of mechanical energy and travels as a longitudinal wave.
  • Sound cannot travel through a vacuum because it needs particles to transmit vibrations.

Properties of Sound Waves

Property Description
Type Longitudinal wave (vibrations parallel to direction of travel)
Medium Requires a medium (air, water, solids) to travel
Speed ~343 m/s in air at room temperature; faster in liquids and solids
Frequency Determines pitch (measured in Hz)
Amplitude Determines loudness (greater amplitude = louder sound)
Wavelength Distance between compressions or rarefactions

Real-World Uses of Sound Energy

Application Description
Communication Speech, telephones, microphones, and speakers
Medical imaging Ultrasound scans use high-frequency sound waves
Navigation SONAR (Sound Navigation and Ranging) used by submarines and ships
Entertainment Music, cinema, and broadcasting systems
Industrial testing Ultrasonic waves detect cracks in materials
Animal echolocation Bats and dolphins use sound to locate objects

Energy Transfers Involving Sound

Scenario Energy Transfer Pathway
Speaking Chemical (muscles) → Kinetic (vocal cords) → Sound
Loudspeaker Electrical → Kinetic (diaphragm) → Sound
Microphone Sound → Kinetic (diaphragm) → Electrical
Ultrasound scan Electrical → Sound → Reflection → Electrical
Bell ringing Kinetic → Sound + Thermal

Exam Tips for All Boards

Use correct terminology

  • Say “sound is a longitudinal wave” and “requires a medium to travel.”

Understand wave behaviour

  • Know how sound reflects (echo), refracts (changes speed in different media), and is absorbed.

Know the human hearing range

  • 20 Hz to 20,000 Hz (20 kHz) — frequencies outside this range are infrasound and ultrasound.

Draw wave diagrams

  • Show compressions and rarefactions for longitudinal waves.

Link to energy stores

  • Sound energy is often a waste output in machines (e.g. engines, drills).

Practice calculations

  • Use the wave speed equation:
  • v = λ x f
  • where v = speed (m/s),  f = frequency (Hz), λ = wavelength (m)

Worked Example

Q: A sound wave has a frequency of 500 Hz and a wavelength of 0.68 m. What is its speed?

A: v = 0.68 x 500 = 340 m/s

Make sure you can rearrange the wave equation i.e. λ = v / f  and f = v / λ

Keywords, phrases and learning objectives on sound energy transfer

Know that sound waves are caused by vibration and can transfer energy from one place to another - but do require a medium to vibrate through.

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 INDEX ENERGY: Types, stores, transfers, energy calculations

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