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Wavelength remains constant (unchanged) in this case. f_apparent = (u + u / 5) / u × f = 1.2f. Calculate f_apparent when u = 5 m/s and f = 600 Hz.

1. 103 Hz
2. 1412 Hz
3. 5000 Hz
4. 720 Hz

Correct answer: 720 Hz

Solution

The apparent frequency is given by f_apparent = (u + u/5) / u × f. Substituting u = 5 m/s and f = 600 Hz, we get f_apparent = (5 + 5/5) / 5 × 600 = (5 + 1) / 5 × 600 = 6/5 × 600 = 720 Hz.

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