PH-1597

A.c. generator

Physics · Secondary 4 · Medium · A.c. generator

A small generator produces an alternating e.m.f. that is displayed on an oscilloscope. The time between two successive peaks is 4.0 ms. What is the frequency of the e.m.f.?

$250\,\text{Hz}$
$40\,\text{Hz}$
$400\,\text{Hz}$
$2500\,\text{Hz}$

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