A) 470 Hz
B) 490 Hz
C) 480 Hz
D) 460 Hz
Correct Answer: A
Solution :
Beats are produced when two waves whose frequencies are only slightly different interfere with each other. \[{{f}_{b}}=|{{f}_{1}}-{{f}_{2}}|\] \[\therefore \] \[10=480-f\] ...(i) \[10=f-480\] ...(ii) Since, beats decrease, hence \[f=480-10=470\]You need to login to perform this action.
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