The voltage of an $ac$ source varies with time according to the equation $V = 100\sin \,\left( {100\pi t} \right)\cos \,\left( {100\pi t} \right)$ where $t$ is in seconds and $V$ is in volts. Then

  • A

    The peak voltage of the source is $100\,volts$

  • B

    The peak voltage of the source is $50\,volts$

  • C

    The peak voltage of the source is $100/\sqrt 2\,volts$ 

  • D

    The frequency of the source is $50\,Hz$

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