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A source of sound produces 20 compressions and 20 rarefactions in 0.2 seconds. The distance between a compression and the next rarefaction is 50cm. find

the wavelength, frequency, timeperiod.


We know that  20 compressions and 20 rarefactions make   20 oscillation
of the wave so the time period is 0.2/20=0.01 s
so  frequency is  f=1/T
1/0.01=100 Hz 
distance between rarefaction and compression is 50 cm so  distance between two rarefactions and two compressions is 2*50=100 cm=1 m
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