A generator produces a voltage that is given by $V = 240\,sin \,120\,t$, where t is in seconds. The frequency and $ r.m.s.$ voltage are

  • A

    $60 Hz and 240 V $

  • B

    $19 Hz and 120 V$

  • C

    $19 Hz and 170 V$

  • D

    $754 Hz and 70 V$

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