Assertion :Statement-1 : Velocity of sound waves does not change appreciably as the waves propagate upwards from surface of Earth [for a small distance].
and Reason: Statement-2 : Density and pressure decrease but as long as the temperature remains constant the velocity of sound remains unchanged.

Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1

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Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1

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Satement-1 is True, Statement-2 is False

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Statement-2 is False, Statement-2 is True

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Solution

The correct option is A Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1
Velocity of sound in air, $v \propto \sqrt{\frac{P}{ρ}} \propto \sqrt{T}$
Both density of air and pressure decrease with altitude, but for small distance temperature remains almost constant.
Hence velocity of sound waves does not change appreciably.

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- 1 :

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a > 1

- 2 :

a > 1, {log}_{a} x

\sum_{r = 0}^{n} (r + 1)^{n} C_{r} = (n + 2) 2^{n - 1} .

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\sum_{r = 0}^{n} (r + 1)^{n} C_{r} = (n + 2) 2^{n - 1} .

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N H_{3}

P H_{3}

N H_{3}

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