NCERT Solutions for Chapter: Sound, Exercise 11: Exercises

A sound wave travels at a speed of $339 \mathrm{m} {\mathrm{s}}^{–1}$. If its wavelength is $1.5 \mathrm{cm},$ what is the frequency of the wave? Will it be audible?

What is reverberation? How can it be reduced?

What is loudness of sound? What factors does it depend on?

Explain how bats use ultrasound to catch a prey.

How is ultrasound used for cleaning?

Explain the working and application of a sonar.

A sonar device on a submarine sends out a signal and receives an echo $5 \mathrm{s}$ later. Calculate the speed of sound in water if the distance of the object from the submarine is $3625 \mathrm{m}$.

Explain how defects in a metal block can be detected using ultrasound.