I have a silly question to ask, just to refresh my knowledge on Sampling in DSP. Please can someone check if what I am doing is correct and correct me along the way. I am preparing for a test which covers old work that was done at the beginning of the year and I have forgotten some important concepts.

**Question:**

A 100 Hz signal is sampled at 250 Hz. Discuss if aliasing has occurred and how many periods of the signal is required to obtain one period of the sampled signal?

A 100 Hz signal is sampled at 250 Hz. Discuss if aliasing has occurred and how many periods of the signal is required to obtain one period of the sampled signal?

My Answer:

Aliasing will not occur since the sampled frequency (250 Hz) is more than twice the maximum frequency (100 Hz)

100/250 = 2/5 so the period is 5

The Period of 100 Hz is 1/100

So I took (5/(1/100)) which is 500

thank you.