the phenomenon where a sound produced is heard again due to reflection is called

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The phenomenon of echo of sound waves is due to:

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Question

The phenomenon of echo of sound waves is due to:

A

Reflection

B

Interference

C

Diffraction

D

All of the above

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Updated on : 2022-09-05

Solution Verified by Toppr

Correct option is A)

Answer is A.

Like all waves, sound waves can be reflected. Sound waves suffer reflection from the large obstacles. As a result of reflection of sound wave from a large obstacle, the sound is heard which is named as an echo. Ordinarily echo is not heard as the reflected sound gets merged with the original sound. Certain conditions have to be satisfied to hear an echo distinctly (as a separate sound).

Hence, the phenomenon of echo of sound waves is due to reflection.

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[Solved] Echoes are heard due to the phenomenon of ________.

CONCEPT: Echo: If we shout or clap near a suitable reflecting object such as a tall building or a mountain, we will hear t

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Echoes are heard due to the phenomenon of ________.

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RRC Group D Previous Paper 26 (Held On: 22 Sept 2018 Shift 3)

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Reflection of sound waves

Resonance

Interference of sound waves

Refraction of sound waves

Answer (Detailed Solution Below)

Option 1 : Reflection of sound waves

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CONCEPT:

Echo: If we shout or clap near a suitable reflecting object such as a tall building or a mountain, we will hear the same sound again a little later. This sound which we hear is called an echo.

Echoes are heard due to the phenomenon of Reflection of sound waves.

To hear the echo clearly, the reflecting object must be more than 17.2 m from the sound source for the echo to be heard by a person standing at the source.

EXPLANATION:

Echoes are heard due to the phenomenon of reflection of sound. So option 1 is correct.

In the case of resonance, interference, and refraction of sound there is no echo. So options 2, 3, and 4 are wrong.

SONAR (sound navigation ranging) uses the principle of reflection of soundwaves and submarine can detect objects nearby or distant.

Echolocation is widely used by bats and whales.

Bats cannot see but they send out waves from the mouth or nose and perceives the echo to know to the approximate distance of the object.

Most mammals like whales produce high-frequency sound or sonar clicks. Whales can recognize the size of the object and the distance almost instantly when they receive echo.

The velocity of sound in dry air is approximately 343 m/s at a temperature of 25 °C.

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Echo is due to(A) Reflection of sound(B) Refraction of sound(C) Both reflection and refraction of sound(D) Diffraction of sound

Echo is due to(A) Reflection of sound(B) Refraction of sound(C) Both reflection and refraction of sound(D) Diffraction of sound. Ans: Hint Just like light, the sound wave can reflect off surfaces too. Unlike light waves, sound waves have a very long ...

Echo is due to

(A) Reflection of sound

(B) Refraction of sound

(C) Both reflection and refraction of sound

(D) Diffraction of sound

Last updated date: 12th Mar 2023

• Total views: 256.5k • Views today: 2.36k Answer Verified 256.5k+ views 1 likes

Hint Just like light, the sound wave can reflect off surfaces too. Unlike light waves, sound waves have a very long wavelength. Thus, sound waves require a much bigger area to get reflected as compared to the light wave.Complete step by step answer:

When a sound wave (longitudinal wave) occurs on a flat and hard surface, it reflects back. This phenomenon of reflection of sound is called echo. For this phenomenon, it is required that the reflecting surface should be much bigger as compared to the wavelength of the sound wave.

A reflected sound can be heard separately and distinctly from the source only if the source is very close to the listener and the reflecting surface is comparatively far from the listener.

Practically, this condition can be realized by the example that we often experience echoes near the mountain (where reflecting surface i.e. the mountains are very far) but if you stand in front of a wall and speak loudly, you don’t observe this phenomenon.

Additional Information

In the case of a numerical, you should keep in mind that the distance travelled by sound waves is double the distance between the source and reflecting surface. So, the velocity of sound can be given as

v= 2d t v=2dt Where, d d

is the distance between the source and reflecting surface.

t t

is the time taken to cover that distance.

Note

Keep in mind that any wave can undergo reflection, refraction, and diffraction. However, the conditions for these to happen depends on the wave. So if a light wave is diffracted by an object, it doesn’t necessarily mean that a sound wave will be diffracted too.

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