Q11 of 50 Page 12

An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s-1?

The time taken by sound to travel from the source to the reflecting surface will be half of this time =

= 1.5 seconds


We know that,


Speed =


342 =


Distance = 342 × 1.5


= 513 m

More from this chapter

All 50 →
9

Calculate that wavelength of a sound wave frequency is 220 Hz and speed is 440 m/s in a given medium.

 10

A person is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of the sound. What is the time interval between successive compressions from the sources?

 12

Two children are at opposite ends of an aluminium rod. One strikes the end of rod with a stone. Find the ratio of times taken by sound wave in air and in aluminium to reach the second child (Given: Speed of sound in air = 346 m/s; Speed of sound in aluminium = 6240 m/s)

 13

Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen. Why?