A) \[a=10,\,T=2\]
B) a=5,T=l
C) a=10,T=l
D) a=5,T=2
Correct Answer: D
Solution :
[d] \[y=5\sin (\pi t+4\pi ),\] comparing it with standard equation \[y=a\,\sin (\omega t+\phi )=a\,sin\left( \frac{2\pi t}{T}+\phi \right)\] \[a=5m\] and \[\frac{2\pi t}{T}=\pi t\Rightarrow T=2\sec \].
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