A bat emits an ultrasonic sound wave at 33.0 kHz and receives an echo 0.1 s later. What is the distance of the bat from the object-producing echo? (Speed of sound in air is 330 m/s)

Question

A bat emits an ultrasonic sound wave at 33.0 kHz and receives an echo 0.1 s later. What is the distance of the bat from the object-producing echo? (Speed of sound in air is 330 m/s) (A) 10.0 m (B) 20.0 m (C) 33.0 m (D) 66.0 m

Tardigrade Admin · Accepted Answer

Given, time in which an echo is received

= 0.1 s

and speed of sound in air

= 330 m / s

Since, the echo received by bat travelled a distance double to the distance between bat and object.

∴ 2 D = v \times

( time )
where,

D =

distance between bat and object and

v =

speed of sound

\Rightarrow D = \frac{v \times time}{2} = \frac{330 \times 0.1}{2}

= 16.5 m

Q. A bat emits an ultrasonic sound wave at 33.0kHz and receives an echo 0.1s later. What is the distance of the bat from the object-producing echo? (Speed of sound in air is 330m/s)

10.0 m

20.0 m

33.0 m

66.0 m

16.5 m

Q. A bat emits an ultrasonic sound wave at $33.0 k Hz$ and receives an echo $0.1 s$ later. What is the distance of the bat from the object-producing echo? (Speed of sound in air is $330 m / s$ )