MHT CET 2025 Physics question
A pipe open at both ends of length 1.5 m is dipped in water at one end such that overtone of vibrating air column is resonating with a tuning fork of frequency 330 Hz. The length of the pipe immersed in water is (Speed of sound in air = 330 m/s) (Neglect end correction)
Answer: (D)
Solution
Once one end is dipped in water, the air column is closed at the water end and open at the other, i.e. a closed pipe of length . Its frequencies are odd harmonics ; the 2nd overtone is the 5th harmonic: . So
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