MHT CET 2024 Physics question
A resonance tube closed at one end is of height 1.5 m. A tuning fork of frequency 340 Hz is vibrating above the tube. Water is poured in the tube gradually. The minimum height of water column for which resonance obtained is (Neglect end correction, speed of sound in air = 340 m/s)
Answer: (D)
Solution
Wavelength of the sound m. In a closed pipe resonance occurs when the air column length is an odd multiple of : cm, cm, cm, ... (the next one, 175 cm, exceeds the tube height of 150 cm). Water level height = tube height air column
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