Class 11 NEET Physics Waves Questions Questions

First case: Frequency = υ ;
No. of beats/sec. =5 and
frequency (sounded with) =200Hz
. Second case: Frequency =2υ;
No. of beats/sec =10 and frequency (sounded with )=420Hz.
In the first case, frequency (υ)=200±5=205 or 195Hz. And in the second case, frequency (2υ)=420±10
or υ=210±5=205 or 215. So common value of υ in both the cases is 205Hz..