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# Acoustics

### Properties of sound

What is the speed of sound in air at room temperature? 343 m/s
What is the range of hearing for the human hearing system? 20Hz to 20kHz
How does sound travel in air? By bouncing particles into other particles in the air
Does sound travel faster in metal than in air? Yes
Why does sound travel faster in more dense material/medium Because the particles or molecules are much closer together - they do not have to travel so far to hit the next particle
Approximately, what is the wavelength of a 20Hz soundwave? 17m
Approximately, what is the wavelength of a 20kHz soundwave? 17mm
Does a high frequency sound travel faster than a low frequency sound? No, they travel at the same speed of sound
What is the unit of frequency? Hertz (Hz) - this used to be known as cycles per second
Amplitude is the measure of what? Amplitude is the measure of how loud a sound is - high amplitude is loud but low amplitude is quiet
Decibel is used as a measure of sound - what is the symbol for decibel? dB
0 dB represents what value of gain? This represents no gain - what comes out is what goes in - it is not reduced or amplified
The reference for dBm is what? 1 mW
What is the periodic time of a soundwave? It is the time taken from the start of a cycle to the end of it - usually represented by 'T'
What is the periodic time for a 20Hz soundwave? 50 ms
What is the periodic time for a 20kHz soundwave? 50 us
Created by: jimbcot

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