JEE Previous Year Question
A tuning fork of frequency 340 Hz resonates in the fundamental mode with an air column of length 125 cm in a cylindrical tube closed at one end. When water is slowly poured in it, the minimum height of water required for observing resonance once again is______ cm. (Velocity of sound in air is 340 )
Topic: JEE PYQ
Answer: 50. Full step-by-step solution below.
Correct answer: 50
Solution
(50)Assumption: Ignore word "fundamental mode" in question.
First resonating length = = 25 cm
Second resonating length = = 75 cm
Third resonating length = = 125 cm
Height of water required = 125 - 75 = 50 cm
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