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Waves

Question
CBSEENPH11026460

Assertion:  The fundamental frequency of an open organ pipe increases as the temperature is increased. 

Reason:  This is because as the temperature increases, the velocity of sound increases more rapidly than length of the pipe.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.

Solution

A.

If both assertion and reason are true and reason is the correct explanation of assertion.

The fundamental frequency of open organ pipe is 

                  n = v2 l

As temperature increase, both v and I increase but I increase more rapidly than I. Hence the fundamental frequency increases as the temperature increases.