Sound WavesHard

Question

Two tuning forks having frequency 256 Hz (A) and 262 Hz (B) tuning fork. A produces some beats per second with unknown tuning fork, same unknown tuning fork produce double beats per second from B tuning fork then the frequency of unknown tuning fork is    

Options

A.262
B.260
C.250
D.300

Solution

      A                    B
  f1    256 Hz        f2        262 Hz
2(f1 - 256) = (f1 - 262) ⇒ f1 = 250 Hz
2(f2 - 256) = (262 - f2) ⇒ f2 = 258 Hz

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