Physics

Time taken to hear the echo if distance between the listener and the obstacle d is given by :
t = d x V
t = 2d x V
t = $\dfrac{V}{2d}$
t = $\dfrac{2d}{V}$

Sound

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Answer

t = $\dfrac{2d}{V}$

Reason — For an echo to be heard, sound must travel from the listener to the obstacle and then back to the listener, covering a total distance of $2d$ . If $V$ is the speed of sound, then the time taken $t$ is:

$t = \dfrac{\text{Total Distance}}{\text{Speed}} = \dfrac{2d}{V}$

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Physics

Time taken to hear the echo if distance between the listener and the obstacle d is given by :
t = d x V
t = 2d x V
t = $\dfrac{V}{2d}$
t = $\dfrac{2d}{V}$

Sound

Answer

Related Questions

The condition for reflection of sound wave is :
surface must be smooth
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reflecting surface must be smaller than the wavelength of the sound wave

For an echo, the reflected sound must reach the person at least …………… after the original sound is heard.
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The minimum distance between the source and the reflector in air, to hear an echo, is approximately:
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To detect the obstacles in their path, bats produce:
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Physics

Time taken to hear the echo if distance between the listener and the obstacle d is given by :t = d x Vt = 2d x Vt = V2d\dfrac{V}{2d}2dV​t = 2dV\dfrac{2d}{V}V2d​

Sound

Answer

Related Questions

The condition for reflection of sound wave is :surface must be smoothsurface must be polishedreflecting surface must be bigger than the wavelength of the sound wavereflecting surface must be smaller than the wavelength of the sound wave

For an echo, the reflected sound must reach the person at least …………… after the original sound is heard.1 s10 s0.1 s0.01 s

The minimum distance between the source and the reflector in air, to hear an echo, is approximately:10 m17 m34 m50 m.

To detect the obstacles in their path, bats produce:Infrasonic wavesUltrasonic wavesElectromagnetic wavesRadio waves.

Time taken to hear the echo if distance between the listener and the obstacle d is given by :
t = d x V
t = 2d x V
t = $\dfrac{V}{2d}$
t = $\dfrac{2d}{V}$

The condition for reflection of sound wave is :
surface must be smooth
surface must be polished
reflecting surface must be bigger than the wavelength of the sound wave
reflecting surface must be smaller than the wavelength of the sound wave

For an echo, the reflected sound must reach the person at least …………… after the original sound is heard.
1 s
10 s
0.1 s
0.01 s

The minimum distance between the source and the reflector in air, to hear an echo, is approximately:
10 m
17 m
34 m
50 m.

To detect the obstacles in their path, bats produce:
Infrasonic waves
Ultrasonic waves
Electromagnetic waves
Radio waves.