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Reflection from an Open End

An air column...

Question

An air column closed at one end and open at the other end resonates with a tuning fork when 45 and 99 cm of length. The wavelength of the sound in air column is

A

36 cm

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B

54 cm

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C

108 cm

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D

180 cm

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Solution

The correct option is B 108 cm
$\frac{λ}{2} = 99 - 45 = 54 c m$ or $λ = 108 c m$

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