An example of longitudinal wave is :

Which of the following is a mechanical wave?

Sound wave in air is –

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

What is the name of the part of the ear that collects sound waves?

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