JEE Main 2016 · 3 Apr · Shift 1 · Physics Q26

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PhysicsSingle correct+4 / -1Question 26 of 90

A pipe open at both ends has a fundamental frequency $f$ in air. The pipe is dipped vertically in water so that half of it is in water. The fundamental frequency of the air column is now :

\dfrac f2

\dfrac{3f}4

2f

f

Answer and worked solution

Official answer: D

Open pipe: $f=\frac v{2L}$ . Half in water, it is a closed pipe of length $\frac L2$ : $f'=\frac v{4(L/2)}=\frac v{2L}=f$ .

Topics:Organ pipes and resonance

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JEE Main 2016 · 3 Apr · Shift 1, Physics question 26