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At resonance air column of length 20cm resonates with a tuning fork of frequency 450Hz. Ignoring end correction, the velocity of sound in air is?

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At resonance air column of length 20cm resonates with a tuning fork of frequency 450Hz. Ignoring end correction, the velocity of sound in air is?

(a) 720m/s

(b) 820m/s

(c) 920m/s

(d) 360m/s

I had been asked this question in an online interview.

The above asked question is from Acoustics in section Waves of Engineering Physics I

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Correct choice is (d) 360m/s

The explanation is: ʎ/4=20cm, ʎ=80cm=0.80m,

γ=450Hz

v=γʎ=450×0.80=360m/s.

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