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14. waves and sound — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
An engine is moving on a circular track with a constant speed. It is blowing a whistle of frequency $500 Hz$. The frequency received by an observer standing stationary at the centre of the track is
  • ✓
    $500 Hz$
  • B
    More than $500 Hz$
  • C
    Less than $500 Hz$
  • D
    More or less than $500 Hz$ depending on the actual speed of the engine
✓

Answer

Correct option: A.
$500 Hz$
a
(a) Since there is no relative motion between the source and listener, So apparent frequency equals original frequency.

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