A tuning fork of frequency 512 Hz makes 4 beats/sec with the vibrating string of a piano. The beat frequency decreases to 2 beats 
. When the tension in the piano string is slightly increased. The frequency of the piano string before increasing tension is.
Text Solution
Verified by ExpertsThe correct answer is:
D
Let 
be frequency of tuning fork and 
be frequency of piano string
Now, 
has either has 516 Hz or 508 Hz
On increasing tension frequency 
is increased and beat frequency decreases. So, 
is 508 Hz before increasing tension.
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