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Electric Charge and Field Physics Electric Charge and Field Physics Class 12th

A running fork of frequency 340 Hz resonates in the fundamental mode with a air column of length 125cm 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 ms^-1)

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alok kumar singh | Contributor-Level 10

2 months ago

First resonating length = $λ = \frac{V}{f} = \frac{340}{340} = 1 m$ $\frac{}{}$

Second resonating length = $\frac{3 λ}{4} = 75 c m$ $\frac{}{}$

Third resonating length = $\frac{5 λ}{4} = 125 c m$ $\frac{}{}$

Height of water required = 125 – 75 = 50cm

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Answered by

alok kumar singh | Contributor-Level 10

2 months ago

First resonating length = $? = \frac{V}{f} = \frac{340}{340} = 1 m$ $\frac{}{}$

Second resonating length = $\frac{3 ?}{4} = 75 c m$ $\frac{}{}$

Third resonating length = $\frac{5 ?}{4} = 125 c m$ $\frac{}{}$

Height of water required = 125 – 75 = 50cm

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