A source of frequency 
gives 5 beats/second when sounded with a source offrequency200 Hz. The second harmonic of frequency 
of source gives 10 beats/second when sounded with a source of frequency 420 Hz. The value of 
is
Text Solution
Verified by ExpertsThe correct answer is:
A
First case: Frequency 
;
No. of beats/sec. 
and
frequency (sounded with) 
Hz.
Second case: Frequency 
; No. ofbeats/sec 
and frequency (sounded with) 
Hz.
In the first case, frequency ( 
) 
or 195 Hz. And in the second case, frequency 
or 
or215. So common value ofu in both the cases is 205 Hz.
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