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A stationary source (see figure below) emits sound waves of frequency f towards a wall. If an observer moving with speed u in a direction perpendicular to the wall, measures a frequency f’ = 9/8 f at the instant shown, then u is related to the speed of sound Vs as
  • a)
    Vs
  • b)
    Vs / 2
  • c)
    Vs / 4
  • d)
    Vs / 8
Correct answer is option 'C'. Can you explain this answer?
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A stationary source (see figure below) emits sound waves of frequency ...
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A stationary source (see figure below) emits sound waves of frequency f towards a wall. If an observer moving with speed u in a direction perpendicular to the wall, measures a frequency f’ = 9/8 f at the instant shown, then u is related to the speed of sound Vs asa)Vsb)Vs / 2c)Vs / 4d)Vs / 8Correct answer is option 'C'. Can you explain this answer?
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