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14. waves and sound — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
$Assertion :$ 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.
  • ✓
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: A.
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
a
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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