Q.

(A) : The velocity of sound changes as we go up in the atmosphere.
(R) : Pressure decreases as we go up in the atmosphere.

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a

(A) is true but (R) is false

b

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

c

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

d

Both (A) and (R) are false

answer is B.

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Detailed Solution

Pressure and density both decreases as we go up in the atmosphere.

But since temperature also changes we can say speed of sound may change.

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