Question

a sound wave has a frequency of 2KHZ and wavelength 35 cm.How long will it take to travel 1.4km

Answer 1

first we have to find speed of wave= frequency of wave× wavelength of wave

frequency= 2×1000=2000htz
wavelength=35cm=0.35m

hence speed =2000×0.35
=700m/s

now time= distance/speed
where distance= 1.4km=1400m

time= 1400/700=2sec

Answer 2

first we have to find speed of wave= frequency of wave× wavelength of wave

frequency= 2×1000=2000htz

wavelength=35cm=0.35m

hence speed =2000×0.35

=700m/s

now time= distance/speed

where distance= 1.4km=1400m

time= 1400/700=2sec

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