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A sound wave has a frequency 2kHz and wave
lungth 40um. calculate the time it takes to
drawed a distame of 1.6 km
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Explanation:
GIVEN:
frequency = n=2kHz= 2x1000 Hz
Wavelength=lambda= 40cm=40/100=0.4m
Speed of sound:
V= frequency * wavelength
=2×1000×0.4
=800m/s
Speed=Distance/ time
Distance= 1.6km= 1.6x1000m
Time= distance/ speed
= 1.6x1000/ 800
=16×100/800
=2sec.
Therefore time required to travel 1.6km is 2sec.
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