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Sound & Ultrasound [including seismic waves] [higher]

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Sound waves are . They cause particles to vibrate parallel to the direction of wave travel. The can travel through solids, liquids or gases. The speed of sound depends on the through which it is travelling. When travelling through air, the speed of sound is about 330 metres per second (m/s). Sound cannot travel through a because there are no particles to carry the vibrations.

The human ear detects sound. Sound waves enter the ear canal and cause the eardrum to vibrate. Three small bones transmit these vibrations to the cochlea. This produces electrical signals which pass through the auditory nerve to the brain, where they are interpreted as sound.

Properties of sound

The of a sound wave is related to the pitch that is heard:

high frequency sound waves are high pitched

low frequency sound waves are low pitched

The of a sound wave is related to the volume of the sound:

high amplitude sound waves are loud

low amplitude sound waves are quiet

traces showing the following sounds:

The cochlea is only stimulated by a limited range of frequencies. This means that humans can only hear certain frequencies. The range of normal human hearing is 20 Hertz (Hz) to 20,000 Hz (20 kHz).

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Sound waves - Sound waves - AQA - GCSE Physics (Single Science) Revision - AQA - BBC Bitesize

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Learn about and revise sound, sound waves, ultrasound and seismic waves with GCSE Bitesize Physics.

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Sample Exam Questions

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Waves -Multiple choice questions - Sample exam questions - AQA - GCSE Physics (Single Science) Revision - AQA - BBC Bitesize

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Learn about and revise Waves exam questions with GCSE Bitesize Physics.