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IIT JEE 2007 Practice : PHYSICS - Multiple Answers

Each question has one or more than one correct choices among (a), (b), (c) and (d). Write down all the correct choices in alphabetical order separated by one space each.
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An open organ pipe of length lresonates with frequency f1 at second harmonic. Now one end of the pipe is closed and the frequency is gradually increased until it first resonates with frequency f2 at n th harmonic. Then

(a) n = 3
(b) n = 5
(c) f2 = (5/4)f1
(d) f2 = (3/4)f1


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