computer communication

Question 1 (20 marks) An analog voltage signal (sine wave) of 100Hz with a peak-to-peak amplitude of 10 Volt is sampled at the sampling frequency of 500Hz. Find another two analog sinusoids (other than 100Hz ) which, when sampled at 500Hz, will yield the identical sample values (as the 100Hz sine wave). Explain: (1) why this situation can happen; (2) what this phenomena is called; and (3) How can one guarantee that the sampled signals are unique representations of the original analog signal