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A sound wave has frequency 5 kHz and wav...

A sound wave has frequency 5 kHz and wavelength 20cm. How long will it take to travel 2 km?

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Frequency (f) = 5 kHz= 5 `xx` 10·00 Hz = 5000 Hz
Wavelength `(lamda)= 20 cm=20/100m=0.2m`
Speed of sound = frequency `xx` wavelength
`=5000Hzxx0.2m`
`=5000xx2/10m//s=1000 m//s`
Now, time (t) = `("distance")/("speed")`
`therefore` Time taken by the sound wave to travel 2 km, i.e., 2000 m
`therefore` Required time = `(2000m)/(1000 m//s)=2` sec
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