When an observer moves towards source with a velocity Uo, then the modified frequency 'fA' becomes:
Correct answer: C. Option C
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation
As the observer is moving towards the source the speed of sound (V) and the velocity of observer Uo add up causing an increase in the observed frequency Fa. As the source is stationary So, the denominator will only have the speed of sound as V +/- Vs = V +/- 0 = V So, the final formula will be Fa = {(V + Uo)/ V} x fa
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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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