A whistler with a velocity of 33 m/s approaches a stationary observer with a frequency of 450 Hz. What is the apparent frequency heard by the observer?
Correct answer: A. 500 Hz
- A. 500 Hz
- B. 400 Hz
- C. 430 Hz
- D. 300 Hz
Explanation
Doppler frequency or apparent frequency when the source moves towards a stationary observer is:
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About Waves
Progressive waves transfer energy through oscillations, with wavelength, frequency, amplitude and wave speed related by v = fλ; sound speed depends on the medium. Superposition produces interference and stationary waves in strings and organ pipes, while simple harmonic motion describes the oscillation itself and must be distinguished from wave propagation.
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