A) \[470\text{ }Hz\]
B) \[490\text{ }Hz\]
C) \[480\text{ }Hz\]
D) \[460\text{ }Hz\]
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 \[f=480-10=470Hz\]You need to login to perform this action.
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