A sound wave has a frequency 2KHz and wavelength 40 cm. How long will it take to travel 1.6 km ?
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Answer: 2 seconds
Explanation:
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.
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