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

  • A
    $60 \text{ Hz and } 240 \text{ V}$
  • B
    $19 \text{ Hz and } 120 \text{ V}$
  • C
    $19 \text{ Hz and } 170 \text{ V}$
  • D
    $754 \text{ Hz and } 70 \text{ V}$

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