A column of air and a tuning fork produce 4 beats per second when sounded together. The tuning fork gives the lower note. The temperature of air is 
. When the temperature falls to 
, the two produce 3 beats per second. Find the frequency of the fork 
Hz.
Text Solution
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(110)
Let the frequency of the tuning fork be n Hz
Then frequency of air column at 
Frequency of air column at 
According to 
, we have
The speed of sound is directly proportional to the square-root of the absolute temperature.
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