Whenever a transverse wave travelling in a denser medium is reflected from the boundary of the rarer medium, _.
Correct answer: D. An incident crest on reflection remains crest
- A. An incident crest on reflection disappears
- B. An incident trough on reflection becomes double
- C. An incident crest on reflection becomes a trough
- D. An incident crest on reflection remains crest
Explanation
If a crest of a transverse wave, in a denser medium, is incident at a point of a rarer medium, as the particles of rarer medium are free to vibrate, it will displace the particle at the point of incidence in the upward direction and after reflection from the rarer medium, a crest returns as a crest or a trough returns as a trough.
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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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