When a transverse wave is reflected on going from a denser to a rarer medium, then:
Correct answer: C. There is no change in phase shift
- A. There is 180° phase shift
- B. A crest is converted into a trough
- C. There is no change in phase shift
- D. Both A and B
Explanation
Reflection from a boundary to a rarer medium generally involves no phase inversion; only reflection at a denser boundary produces a π phase flip. Thus, option C is correct.
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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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