$Assertion :$ The fundemental frequency of an open organ pipe increases as the temperature is increased.
$Reason :$ As the temperature increses, the velocity of sound increases more rapidly than length of the pipe.
$Reason :$ As the temperature increses, the velocity of sound increases more rapidly than length of the pipe.
AIIMS 2017, Easy
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As $f = \frac{v}{{2l}}$ ; and so with increase in temperature v increases more than $l$. Also $v = \sqrt {\frac{{\gamma RT}}{M}} $
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