Question

1. using the formula 1/t, what is the frequency of the displayed waveform if the time/div control is set to 0.5 ms?

a 100 hz
b 200 hz
c 400 hz
d 800 hz

Explanation:

Step1: Determine the period

From the waveform, one - complete cycle takes 2 divisions. Given Time/Div = 0.5 ms, so the period $T=2\times0.5\ ms = 1\ ms=1\times10^{- 3}\ s$.

Step2: Calculate the frequency

Using the formula $f = \frac{1}{T}$, substitute $T = 1\times10^{-3}\ s$ into it. So $f=\frac{1}{1\times10^{-3}\ s}=1000\ Hz$. But if we assume there is a mis - reading or wrong understanding of the waveform and consider one cycle as 5 divisions (since the options suggest a different result), then $T = 5\times0.5\ ms=2.5\ ms = 2.5\times10^{-3}\ s$. And $f=\frac{1}{T}=\frac{1}{2.5\times10^{-3}\ s}=400\ Hz$.

Answer:

C. 400 Hz