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BITSAT 2023Paper 2
Exam
BITSAT
Year
2023
Paper
Paper 2
Subject
Physics
Chapter
Waves and Sound

BITSAT 2023 · Paper 2 · Physics · Waves and Sound

The engine of a train moving with speed 10 ms^ -1 towards a...

The engine of a train moving with speed 10ms−110 \mathrm{ ms}^{-1} towards a platform sounds a whistle at frequency 400Hz400 \mathrm{ Hz}. The frequency heard by a passenger inside the train is (neglect air speed. Speed of sound in air 330ms−1330 \mathrm{ ms}^{-1} )

Options

  1. A200Hz200 \mathrm{ Hz}
  2. B400Hz400 \mathrm{ Hz}
  3. C412Hz412 \mathrm{ Hz}
  4. D388Hz388 \mathrm{ Hz}

Correct answer

B. 400Hz400 \mathrm{ Hz}

Step-by-step solution

The relative velocity of a passenger with respect to source of sound (engine of train) is 0. So there will be no Doppler's effect. So frequency heard is 400Hz400 \mathrm{ Hz}.
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