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JEE Physics · Medium

Sound Waves: Reflection and Echo MCQ

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Reflection and EchoMediumQuestion 31229

Question

Minimum distance from a reflecting wall to hear an echo (assuming human ear can distinguish sounds 0.1 s apart, v_sound = 340 m/s):
  1. A
    34 m
  2. B
    17 m
    Correct
  3. C
    68 m
  4. D
    100 m

Correct answer

17 m

Explanation

Echo heard after 0.1 s. Distance = v×t/2 = 340×0.1/2 = 17 m (sound travels to wall and back).

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