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Sound — Physics STD 10 — Question

ICSE BoardEnglish MediumSTD 10PhysicsSound1 Mark
MCQ
Echo occurs when the distance between source and listener is _________ .
  • A
    10 m
  • B
    17 m
  • ✓
    greater than 17 m
  • D
    34 m
✓

Answer

Correct option: C.
greater than 17 m
(c)
greater than 17 m
Explanation:
An echo is perceptible when the one-way distance between the source and listener is over 17 metre allowing sufficient time for sound to travel, reflect and be distinguished as a separate sound.

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