An oscilloscope's seconds/division switch is set on 20 ms/ div . If a sine wave measures 4 divisions horizontally, what frequency is being measured?
A) 12.5 Hz
B) 25 Hz
C) 50 Hz
D) More information is needed.

Question

An oscilloscope's seconds/division switch is set on  20 ms/ div . If a sine wave measures 4 divisions horizontally, what frequency is being measured?
A)  12.5  Hz
B)  25  Hz
C)  50  Hz
D) More information is needed.

Quizplus · Accepted Answer

The period of the sine wave is 4 divisions * 20 ms/div = 80 ms. The frequency is the reciprocal of the period, so 1 / 0.08 s = 12.5 Hz.

An Oscilloscope's Seconds/division Switch Is Set on 20 Ms