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An airplane produces a sound wave with frequency of 5KHz and wavelength 30m. in how much time would the sound wave cover 4km




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F = 5KHz = 5000Hz
wavelength = 30m
speed = frequency*wave length = 5000*30 = 150000 m/s = 150 km/s

distance = 4km
time required = 4/150 s = 2/75 second
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