What is minimum sampling frequency that should be used to an

What is minimum sampling frequency that should be used to analyze a 100 Hz signal? Why?

Ans)

By Nyquist Sampling Criterion,minimum sampling frequency require should be greater than twice the frequency of the signal you want to analyze

so in this problem it is 2*100=200Hz

Minimum Sampling frequency is 200 Hz

If sampling frequency is less than this aliasing will occur and you cannot recreate the original signal from the sampled signal