Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Velocity of sound in air is 320 m/s. A pipe closed at one end has a length of 1 m. Neglecting end corrections, the air column in the pipe can resonate for sound of frequency (1) 80 Hz (2) 240 Hz (3) 320 Hz (4) 800 HzA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: B
Solution :
For closed pipe \[f=n\left( \frac{v}{4l} \right),\] \[n=1,3,5......\] For \[n=1\] \[{{f}_{1}}=\frac{v}{4l}=\frac{320}{4\times 1}=80\,Hz\] For\[n=3\] \[{{f}_{3}}=3{{f}_{1}}=240\,Hz\] For \[n=5\] \[{{f}_{5}}=5{{f}_{1}}=400\,Hz\]
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