A wave is going from one medium to another, then which of its property may/must change

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Frequency

Wavelength

Velocity

Amplitude

answer is B, C, D.

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Detailed Solution

Frequency is the property of source while velocity is the property of medium and wavelength is the property of both medium and source. So, wavelength and velocity of wave must change as medium changes, while frequency remains same. On the boundary some absorption can be there as a result the amplitude (and hence intensity) can decrease as medium has been changed.Also a smaller fraction of the incident energy is reflected back into the medium due to which amplitude of transmitted wave decreases .

Amplitude will either decrease or remains same but it can never increase due to change in medium. (Assuming no external source is providing energy)

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