A tuning fork 
of unknown frequency produces 5 beats/s with a fork of known frequency 
. When fork 
is filed, the beat frequency decreases to 2 beats/s. What is the frequency of fork 
?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Initially, beat frequency 
So, 
or 
After filing frequency increases slightly, so new frequency of 
Beat frequency 
New 
or 
Hence, original frequency of 
is 
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