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A siren emitting at 600 Hz approaches a stationary observer at 30 m/s. If the speed of sound is 330 m/s, the observed frequency is:

  1. (a) 660 Hz
  2. (b) 550 Hz
  3. (c) 720 Hz
  4. (d) 500 Hz
Answer and solution

Answer (a) 660 Hz

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