Ultrasonics are sound waves of frequency:

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

Speed of sound _________ if we increase frequency.

Sound and light waves are

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

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