midterm question related FFT

[terbiolagic]

I'm in a jam, about multidisciplinary courses midterm, the question shown in below like a caoss because of being thermo&fluid person

For each case below, a sine wave at frequency f is sampled digitally at sampling
frequency fs, and an FFT is performed on the sampled data. For each case, at what frequency
will there be a peak in the frequency spectrum? Show all your calculations for full credit.
(a) f = 100 Hz, fs = 120 Hz
(b) f = 1000 Hz, fs = 660 Hz
(c) f = 100 Hz, fs = 220 Hz

I'm waiting your comments

 

[Mityan]

Read this thread:
https://www.edaboard.com/threads/273408/

thylacine1975 explained all.

 

[terbiolagic]

Thanks Mityan