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Sound produced from equally spaced steps in a stair case at regular intervals is due to which effect?

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Sound produced from equally spaced steps in a stair case at regular intervals is due to which effect?

(a) Reverberation effect

(b) Noise effect

(c) Absorption effect

(d) Echelon effect

I had been asked this question in an interview for internship.

Question is from Reverberation topic in division Waves of Engineering Physics I

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Correct answer is (d) Echelon effect

To elaborate: If there is a regular repetition of the original sound to the observer then the effect is called Echelon effect. Sound produced by equally spaced steps in stairs at regular intervals produce echelon effect.

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