(A) : In a progressive longitudinal wave, the amplitude of the wave will be the same at all points of the medium along the direction of the motion of the wave
(R) : There is a continuous change of the phase angle of the wave as it progresses in the direction of motion.

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(A) is true but (R) is false

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

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

Both (A) and (R) are false

answer is B.

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Detailed Solution

In a progressive longitudinal wave, the amplitude of the wave will be the same at all points of the medium along the direction of the motion of the wave.
Also, there is a continuous change of the phase angle of the wave as it progresses in the direction of motion.

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