A sound wave has a frequency `1000 Hz` and wavelength `34 cm`. How long will it take to move through `1 km` ?

Answer

3

Explanation

Here, frequency of the wave, ` v = 1000" Hz"`
wavelength of the wave, `lambda = 34" cm" = 0.34" m"`
Speed of sound wave, `v = upsilon lambda = 1000 xx 0.34 = 340"m s"^(-1)`
Time taken by the wave to move through 1 km (1000 m),
`t =` distance/speed `= (1000 m)/( 340"m s"^(-1) ) = 2.94 s ~~ 3 sec`