STANDARDPhysics-Waves
STANDARD Physics Sound Waves MCQ Question
Type: MCQ-numerical-Medium-Class 11
A pipe 30 cm long, is open at both ends. Which harmonic mode of the pipe resonates a 1.1 kHz source? (Speed of sound in air = 330 m s⁻¹)
A
First
B
Second
C
Third
D
Fourth
Correct Answer
Option B
Detailed Explanation
For an open pipe, the frequency of the nth harmonic is v_n = nv/2L. Solving for n with v_n = 1.1 kHz gives n = 2, indicating the second harmonic.
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