Repetition of original sound heard after reflection is called
A
resonance
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B
echo
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C
dissonance
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D
sonar
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Solution
The correct option is B
echo
Explanation of correct answer:
(B) Echo:
It is a common experience that when we shout in front of a high mountain or a deep well or in a big empty hall, we hear our sound back after a few seconds.
This is known as echo.
An echo is the repetition of the original sound heard after the sound is reflected from a distant, dense and rigid object (such as a high building, cliff, etc.).
Explanation of incorrect answer:
(A) Resonance:
It is the relatively large selective response of an object or a system that vibrates in step or phase, with an externally applied oscillatory force.
Resonance was first investigated in acoustical systems such as musical instruments and the human voice.
(C) Dissonance:
A combination of two (or more) tones of different frequencies results in a musically displeasing sound.
(D) Sonar:
The word 'sonar' refers to Sound Navigation and Ranging.
It is an instrument used to find the depth of a sea or investigate underwater objects like submarines and shipwrecks.
It is based on the principle of reflection of sound.