A) 2
B) 3
C) 1
D) 0
Correct Answer: C
Solution :
Frequency of beats \[\frac{9}{4}{{m}^{4}}=\frac{9}{2}\,{{m}^{2}}-\frac{9}{4}\Rightarrow \,{{m}^{4}}\,=2{{m}^{2}}-1\]
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