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Speed of sound wave is v. If a reflector moves towards a stationary source emitting waves of frequency f with speed u, the wavelength of reflected wave will be :
  • a)
  • b)
  • c)
  • d)
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Speed of sound wave is v. If a reflector moves towards a stationary so...
Apparent frequency for reflector (will act as an observer) would be :

where f = actual frequency of source.
After being reflected the apparent frequency will further change and the reflector will now behave as a source. The apparent frequency will now become :

Substituting value of f1, we get

The correct answer is: 
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Speed of sound wave is v. If a reflector moves towards a stationary source emitting waves of frequency f with speed u, the wavelength of reflected wave will be :a)b)c)d)Correct answer is option 'D'. Can you explain this answer?
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