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An observer moves directly away from a stationary source at speed vₒ. The apparent frequency is (sound speed v, source frequency f):

  1. (a) f(v + vₒ)/v
  2. (b) f(v - vₒ)/v
  3. (c) fv/(v + vₒ)
  4. (d) fv/(v - vₒ)
Answer and solution

Answer (b) f(v - vₒ)/v

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Study Sound Waves

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