A sound wave has a frequency of 5 kHz and wavelength of 0.5 m. How much time will it take to travel 5 km?

Explanation

The wave speed is frequency times wavelength: v = 5000 × 0.5 = 2500 m/s. The travel time is distance divided by speed, t = 5000/2500 = 2 s. The medium is unspecified; this speed must not be presented as the ordinary speed in air.