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In an experiment to determine the velocity of sound in air at room temperature using a resonance tube, the first resonance is observed when the air column has a length of 20 . 0   cm for a tuning fork of frequency 400   Hz is used. The velocity of the sound at room temperature is 336   m   s - 1 . The third resonance is observed when the air column has a length of _____ cm

Correct answer

0

Step-by-step solution

Wavelength of wave ⇒ λ = v f = 336 400 = 84   cm At first resonance λ 4 = l + e ⇒ 84 4 = 20 + e , where, e is end correction. ⇒ e = 1 So third resonance length 5 λ 4 = l 2 + e 5 21 = l 2 + 1 l 2 = 104   cm

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