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

Solution:
Given,
Frequency, ν = 2 kHz = 2000 Hz
Wavelength, λ = 35 cm = 0.35 m
We know that speed, v of the wave
= wavelength × frequency
v = λ ν
= 0.35 m × 2000 Hz = 700 m/s

The time taken by the wave to travel a
distance, d of 1.5 km is

t = d / v = 1.5 x 1000 m / 700 m/s = 15/7 sec = 2..1 sec
Thus sound will take 2.1 s to travel a
distance of 1.5 km.