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Physics · PYQ NEET UG 2025
हिन्दीA pipe open at both ends has a fundamental frequency \( f \) in air. The pipe is now dipped vertically in a water drum to half of its length. The fundamental frequency of the air column is now equal to :
Correct answer · Option 2
\( f \)
Explanation
An open pipe has \( f = \frac{v}{2L} \). When dipped to half its length, it becomes a closed pipe of length \( L' = \frac{L}{2} \), so \( f' = \frac{v}{4L'} = \frac{v}{4(L/2)} = \frac{v}{2L} = f \).
