Physics-
General
Easy
Question
Vibrating tuning fork of frequency n is placed near the open end of a long cylindrical tube. The tube has a side opening and is fitted with a movable reflecting piston. As the piston is moved through 8.75 cm, the intensity of sound changes from a maximum to minimum. If the speed of sound is 350 m/s. Then n is
- 500 Hz
- 1000 Hz
- 2000 Hz
- 4000 Hz
The correct answer is: 1000 Hz
When the piston is moved through a distance of 8.75cm, the path difference produced is 
. This must be equal to
for maximum to change to minimum. \ 
cm Þ 
So, 
Þ 
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