Q129 / 150 · MHT CET 2021 (23 Sep Shift 1) · Physics

When an air column in a pipe open at both ends vibrates such that four antinodes and three nodes are formed, then the corresponding mode of vibration is

A
first overtone
Correct answer
B
second overtone
C
fourth overtone
D
third overtone

Solution

$$ \text { Since } \mathrm{L}=\frac{3 \lambda}{2} \text {, it is third harmonic or second overtone. } $$

Hence, the correct answer is option: 'B'.

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