Assertion :In the experiment of finding speed of sound by resonance tube method, as the level of water is lowered, wavelength increases. Reason: By lowering the water level number of loops increases.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
When we lower the water level in a resonance tube , length of air column increases hence number of loops (numbers of nodes and antinodes ) increases , hence we get more harmonics with higher frequency and lower wavelength . Therefore assertion is incorrect but reason is correct .

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