answer)
we know the formula
f=nv/2l
n=10
l=2m
v=T/u
so for f1
v=120/.0065=136m/s
so using eqn 1
f1=10*1360/4=340Hz
for f2
v=130/0.0065=141Hz
f2=10*141.42/4=354Hz
beat frequncy=f2-f1=354-340=14Hz
so the correct option is 15Hz. ( since its closer 14Hz)
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