R P Goyal and S P Tripathi Solutions for Chapter: Propagation of Sound Waves, Exercise 1: EXERCISE–8(A)

An observer $\mathrm{A}$ fires a gun and another observer $\mathrm{B}$ at a distance $1650 \mathrm{m}$away hear its sound. If the speed of sound is $330 {\mathrm{ms}}^{-1}$, find the time when $\mathrm{B}$ will hear the sound after firing by $\mathrm{A}$.

The time interval between a lightening flash and the first sound of thunder is $5 \mathrm{s}$. If the speed of sound in air is $330 {\mathrm{ms}}^{-1}$. Find the distance of flash from the observer.

A boy fires a gun and another boy at a distance hears the sound of fire $2.5 \mathrm{s}$ after seeing the flash. If the speed of sound in air is $340 {\mathrm{ms}}^{-1}$, find the distance between the boys.

An observer sitting in the line of two tanks watches the flashes of two tanks firing at each other at the same time, but he hears the sounds of two shots $2 \mathrm{s} \mathrm{and} 3.5 \mathrm{s}$ after seeing the flashes. If the distance between the two tanks is $510 \mathrm{m}$ find the speed of sound.

How long will sound take in an iron rail $3.3 \mathrm{km}$long?  ( take the speed of sound in iron=$5280 {\mathrm{ms}}^{-1}$)

How long will sound take in air $3.3 \mathrm{km}$long? (take the speed of sound in air =$330 {\mathrm{ms}}^{-1}$)

Assuming the speed of sound in air equal to $340 {\mathrm{ms}}^{-1}$, find the time taken to travel a distance $1700 \mathrm{m}$ by sound in air.

Assuming the speed of sound in water equal to $1360 \mathrm{m} {\mathrm{s}}^{-1}$, find the time taken to travel a distance $1700 \mathrm{m}$ by sound in water.