1 (A) A Sine Wave At Frequency F= 90 Hz Is Sampled Digitally At Sampling Frequencies Fs=200 160 And 50 Hz

Both 50 Hz and 90 Hz start from amplitude 1. Their maxima and minima are same but time period vary.
90 Hz has a bigger time period while 50 Hz has a much smaller time period.
2. Mechanical Engineering