Q5 of 50 Page 12

Define amplitude ?

Amplitude is the objective measurement of the degree of change (positive or negative) in atmospheric pressure (the compression and rarefaction of air molecules) caused by sound waves.

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3 Define compression and rarefaction. 4 Show how the speed of sound depends on the humidity of air? 6 What keeps the simple pendulum oscillating? 7 What is the frequency in hertz, if 25 waves are produced per second?