A generator produces a voltage that is given by \( V=240 \sin 120 t \), where \( t \) is in seco...

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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. ₹oltage are
(A) \( 60 \mathrm{~Hz} \) and \( 240 \mathrm{~V} \)
(B) \( 19 \mathrm{~Hz} \) and \( 170 \mathrm{~V} \)
(C) \( 754 \mathrm{~Hz} \) and \( 70 \mathrm{~V} \)
(D) \( 19 \mathrm{~Hz} \) and \( 120 \mathrm{~V} \)
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