Q.

(A) : When a wave goes from one medium to other, average power transmitted by the wave may change.
(R) : Due to a change in the medium, amplitude, speed, wavelength and frequency of the wave may change.

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a

Both (A) and (R) are true and (R) is the correct explanation of (A)

b

Both (A) and (R) are true but (R) is not the correct explanation of (A)

c

(A) is true but (R) is false

d

Both (A) and (R) are false

answer is C.

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Detailed Solution

When a wave goes from one medium to other, speed changes so the average power transmitted by the wave may change.
Due to a change in the medium, only frequency of the wave remains same.

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(A) : When a wave goes from one medium to other, average power transmitted by the wave may change.(R) : Due to a change in the medium, amplitude, speed, wavelength and frequency of the wave may change.