Home
Class 9
PHYSICS
A child hears the echo of a sound 4 s af...

A child hears the echo of a sound 4 s after its reflection from a cliff. How far is the cliff from the child? [Take velocity of sound in air = 344 m `s^(-1)`]

Text Solution

Verified by Experts

Let the distance of the cliff from the child=d
Total distance travelled by the sound, S=2d
Time taken, t = 4s
Distance of the cliff, d = ?
Velocity = `("Distance")/("Time")`
`v=(2d)/(t)`
`:. d=(v xx t)/(2) implies d=(344 xx 4)/(2)=688 m`
Distance of the cliff = 688 m
Promotional Banner

Topper's Solved these Questions

  • SOUND

    CENGAGE PHYSICS|Exercise MANDATORY EXERCISE(EXERCISE SET I)|29 Videos

  • SOUND

    CENGAGE PHYSICS|Exercise MANDATORY EXERCISE(EXERCISE SET II)|17 Videos

  • FRICTION

    CENGAGE PHYSICS|Exercise OLYMPIAD AND NTSE LEVEL EXERCISES (Read the given statements and select the correct option.)|1 Videos

  • STATICS

    CENGAGE PHYSICS|Exercise OLYMPIAD AND NTSE LEVEL EXERCISES|9 Videos

Similar Questions

Explore conceptually related problems

A child hears an echo from a cliff 4 s after the sound of a powerful cracker is produced. How far away is the cliff from the child ? (Take speed in air as 340 m//s ) ?

The minimum distance to hear an echo is (Taking the velocity of sound in air to be 330 m s^(-1) )

A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of 15ms^-1 . Then the frequency of sound that the observer hears in the echo reflected from the cliff is (Take velocity of sound in air =330ms^-1 )

If a thunder is heared by a man 4 seconds after the lightning is seen, how far is the lighting from the man? (Speed of sound in air = 330 m//s) .