When the source of sound moves towards the stationary observer, the value of apparent frequency 'fo' is:
Correct answer: B. Option B
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation
The formula to calculate the apparent frequency (f°) of a sound wave due to the Doppler effect is given by:f°= (V± Uo/ V± Ui) × fwhere V is the speed of sound, Uo is the speed of the observer, Ui is the speed of the sound source, and f is the actual frequency of the sound wave.When a source of sound moves towards a stationary observer, the observer perceives the frequency of the sound to be higher than the actual frequency. Therefore the sign in the denominator would be negative to get higher apparent frequency than actual frequency. The observer is stationary, so the speed of the observer (Uo) is zero. Thus the formula in this case would be:f°= (V/V-Ui) × f
This question appeared on the UHS MDCAT 2012 paper, which you can sit online with every answer explained.
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