Embibe Experts Solutions for Exercise 1: ICSE-2018

What do you understand by free vibrations of a body?

Why does the amplitude of a vibrating body continuously decrease during damped vibrations?

Draw a graph between displacement from mean position and time for a body executing free vibration in a vacuum.

A sound wave travelling in water has wavelength $0.4 \mathrm{m}$. Is this wave audible in air? (The speed of sound in water$=1400 \mathrm{m} {\mathrm{s}}^{-1}$)
 

Name the system which enables us to locate underwater objects by transmitting ultrasonic waves and detecting the reflecting impulse.

What are acoustically measurable quantities related to pitch and loudness?

When a tuning fork [vibrating] is held close to the ear, one hears a faint hum. The same [vibrating tuning fork] is held such that its stem is in contact with the table surface, then one hears a loud sound. Explain.

A man standing in front of a vertical cliff fires a gun. He hears the echo after $3.5 \sec$. On moving closer to the cliff by $84 \mathrm{m}$, he hears the echo after $3 \sec$. Calculate the distance of the cliff from the initial position of the man.