Why are frequency values rounded in signal using FFT?

Question

So, I am trying to figure out how to use DFT in practice to detect prevalent frequencies in a signal. I have been trying to wrap my head around what Fourier transforms are a

Answer 1

Since you want to get a resolution of 0.01 Hz, you will need to sample at least 100 sec worth of data. You will be able to resolve frequencies up to about 22.05 kHz.