Question

An oscilloscope is set on a TIME/DIV setting of 50 ms. There are 10 divisions on the time scale. A sinewave on the oscilloscope display has exactly three full cycles of the sine wave that fit on the 10 divisions. What is the frequency of the wave?

Answer 1

f= 6 Hz

Step-by-step explanation:

• Since the TIME/DIV setting is set to 50 ms, and there 10 divisions on the time scale, that means that full scale display is 500 msec.
• If a sinewave has exactly three full cycles of the sine wave that fit on the 10 div, this means that one cycle is just one-third of the 10 div value, as follows:

`T = (500 msec)/(3) = 166.7 msec (1)`

• Since the frequency of a wave is just the number of cycles per unit time, can be written as follows:
• F = 1/T = 1/(166.7 msec) = 6 Hz