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Properties of sound waves: Waves
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14 Terms
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Sound wave
Longitudinal waves that cause particles to vibrate parallel to the direction of wave travel
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Medium
A material through which a wave can be transmitted
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Mediums that sound can travel through
Sound can travel through solids, liquids and gases
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Speed of sound
Depends on the medium that the sound is travelling through
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Speed of sound in air
Approx. 330 metres per second (m/s)
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Speed of sound in a vacuum
Sound cannot travel through a vacuum because it needs particles to vibrate
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How the ear allows sounds to be heard
Sound waves cause the ear drum and other parts to vibrate which causes the sensation of sound
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Frequency of a sound wave
Related to the pitch of a sound
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Relationship between frequency and pitch
The higher the frequency, the higher the pitch
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Amplitude of a sound wave
Related to the loudness of a sound
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Relationship between amplitude and loudness
The higher the amplitude, the louder the sound
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Range of human hearing
20 Hz to 20,000 Hz
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Ultrasound
Sound waves that have a frequency higher than the upper limit for human hearing (above 20,000 Hz)
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Infrasound
Sound waves that have a frequency lower than the lower limit for human hearing (below 20 Hz)
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