Extra exam question E7F05

WhyAn analog signal must be sampled at least twice the rate of its highest frequency component to be accurately reproduced. To be accurately reproduced, an analog signal must be sampled at a rate at least twice the frequency of its highest frequency component, the Nyquist sampling theorem's fundamental requirement, sampling any slower risks aliasing and permanently losing information about the original signal, answer B. Sampling at half, at the same rate as, or even at four times that highest frequency describes either an inadequate rate (undersampling) or simply overstates the actual minimum requirement.