The frequency (ƒ), wavelength (λ) and speed (v) of a sound wave are related as

A sound wave has a frequency of 1 kHz and wavelength 50 cm. How long will it take to travel 1 km?

Ultrasonics are sound waves of frequency:

A sound wave has a frequency of 4 kHz and wavelength 30 cm. How long will it take to travel 2.4 km ?

Speed of sound _________ if we increase frequency.

Which one of the following cannot be the unit of frequency of a sound wave?