A pipe open at both ends produces a note of frequency f1. When the pipe is kept with 34th of its length in water it produces a note of frequency f2. The ratio f1f2 is
A
34
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B
43
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C
12
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D
2
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Solution
The correct option is C12 Open pipe frequency, f1=v2L
Frequency, f2=v4(L/4)
( ∵ when 3/4th of length is dipped, it acts as closed pipe of length 14 of length )