A tuning fork has a frequency of 400 Hz and hence a period of 2.50 x 10^-3s.If the tuning fork is in an inertial frame of reference moving by the observer at speed of 0.750 c,what is the frequency of the fork as measured by the observer? (Assume that measurements are strictly by optical means and that the speed of sound waves in air is not pertinent here). A)265 Hz B)302 Hz C)454 Hz D)605 Hz

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Quizplus · Accepted Answer

The correct answer is A because the frequency of the tuning fork as measured by the observer is given by the formula f' = f / (1 - v/c), where f is the frequency of the tuning fork in its own frame of reference, v is the speed of the observer relative to the tuning fork, and c is the speed of light. Plugging in the given values, we get f' = 400 Hz / (1 - 0.750) = 265 Hz.

A Tuning Fork Has a Frequency of 400 Hz and Hence