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Q.

A tuning fork having frequency of 340 Hz is vibrated just above a cylindrical tube. The height of the tube is 150 cm. Water is slowly poured in. What is the minimum height of water required for resonance? [v=340m/s]

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a

45 cm

b

25 cm

c

75 cm

d

125 cm

answer is A.

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Detailed Solution

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$λ = \frac{340}{340} = 1 m$ ; $\frac{λ}{4} = 25, \frac{3 λ}{4} = 75$

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A tuning fork having frequency of 340 Hz is vibrated just above a cylindrical tube. The height of the tube is 150 cm. Water is slowly poured in. What is the minimum height of water required for resonance? [v=340m/s]