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A tuning fork of frequency 340Hz vibrated above a cylindrical hallow tube closed at one end. The height of the tube is 120cm . Water is slowly poured in it. What is the minimum height of water required for resonance ?A. 95cmB. 25cmC. 45cmD. 105cm |
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Answer» Correct Answer - C `l_1 = (v)/(4n) = (340)/(4xx340) = 25cm` `l_2=(3v)/(4n) = 3xx0.025 = 75cm` `l_3=5l_1 = 5xx0.25 = 125cm` The height of the tube is 120cm , the maximum height of the air column for resonance is 75 cm so the minimum height of the water is 120-75=45cm. |
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