Dhiren M Doshi Solutions for Chapter: Sound, Exercise 8: Exercises

Which wave property determines the pitch of a sound?

Explain how the principle of echo is used by a dolphin to locate small fishes as its prey.

$50$ waves pass through a point in $0.1$ second. If the distance between one crest and the adjacent trough is $0.34 \mathrm{m}$, calculate the wavelength.

$50$ waves pass through a point in $0.1$ second. If the distance between one crest and the adjacent trough is $0.34 \mathrm{m}$, calculate its wave velocity.

The distance between a crest and a trough is $20 \mathrm{cm}$ in ripples on the surface of the water. When $20$ ripples are produced in one second, calculate the wave velocity.

Divisha and her friend Smita are on the moon. They wanted to share their experiences and feelings. Will Divisha be able to hear any sound produced by her friend Smita? Why?

Lalitha was cleaning the middle ear using a matchstick. Her friend Suparns immediately stopped her from doing so. Why we should not clean our ears using a matchstick or any other pointed object?

Rupesh was studying for his exams. His neighbour Berry was playing tabla. Rupesh was getting disturbed. He asked Berry to play tabla softly. Berry followed his advice. Why is soft sound produced when we strike a drum softly?