The equation of an alternating current is \( I=50 \sqrt{2} \sin 400 \pi t \) A then the frequenc...

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The equation of an alternating current is \( I=50 \sqrt{2} \sin 400 \pi t \) A then the frequency and the root mean square value of the current are respectively
(a) \( 200 \mathrm{~Hz}, 50 \mathrm{~A} \)
(b) \( 400 \mathrm{~Hz}, 50 \sqrt{2} \mathrm{~A} \)
(c) \( 200 \mathrm{~Hz}, 50 \sqrt{2} \mathrm{~A} \)
(d) \( 500 \mathrm{~Hz}, 200 \mathrm{~A} \)
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