Question

A sound wave has a frequency of `2 kHz` and wavelength `35 cm`. How long will it take to travel `1.5 km` ?

Answer 1

Correct Answer - 2.1 s
Here, `v = 2 kHz = 2000 Hz, lamda = 35 cm, v = v lamda = 2000 xx 35 = 700 m//s`
time taken to travel `1.5 km`,i.e., `t = (1.5 km)/(700 m//s) = (1500 m)/(700 m//s) = 2.1 s`.