1.

A glass tube of length 1m is filled with water . The water can be drained out slowly at the bottom of the tube . If a vibrating tuning fork of frequency 250Hz is brought at the upper end of the tube and the velocity of sound is 330 m/s , then the total number of resonance obtained will beA. 4B. 3C. 2D. 1

Answer» Correct Answer - D
`l_1=(v)/(4n) = (330)/(4xx250) = 330/1000`
`l_1 = 0.33m`
=33cm
`l_2=3xxl_1 = 0.3x33=0.99cm`
Number of resonances observed are 2


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