A) \[T=2\pi \sqrt{\frac{1}{20}}\]
B) \[T=2\pi \sqrt{\frac{7}{1000}}\]
C) \[T=2\pi \sqrt{\frac{1}{140}}\]
D) \[T=2\pi \frac{49}{100}\]
Correct Answer: C
Solution :
[c] \[T=2\pi \sqrt{\frac{\mu }{2k}}\] \[\therefore \,\,\mu =\frac{{{m}_{1}}{{m}_{2}}}{{{m}_{1}}+{{m}_{2}}}\] \[T=2\pi \sqrt{\frac{10}{7\times 200}}=\frac{2\times 5}{7}=\frac{10}{7}=2\pi \sqrt{\frac{1}{140}}\]
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