A) 0
B) 1
C) 4
D) 5
Correct Answer: C
Solution :
Number of beats per second\[={{n}_{1}}\sim {{n}_{2}}\] Here, \[{{\omega }_{1}}=2000\,\pi \] \[2\pi {{n}_{1}}=2000\,\pi \] \[{{n}_{1}}=1000\] \[{{\omega }_{2}}=20008\,\pi \] \[\Rightarrow \] \[2\pi {{n}_{2}}=2008\,\pi \] or \[{{n}_{2}}=10004\] \[\therefore \] Number of beats heard per second \[=1004-1000=4\]You need to login to perform this action.
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