A tuning fork 
produces 4 beats per second with another tuning fork 
of frequency 
. On filing one of the prongs of 
, 4 beats per second are again heard when sounded with the same fork B. Then the frequency of the fork 
before filing is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
or 
. As frequency of 
increases on filing therefore the frequency of 
before filing is 
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