Signals and Systems

A signal f(t) = cos 10pt + 3 cos 4pt is instantaneously sampled. The maximum allowable value of sampling interval T_s in sec is

A 1 / 4 sec

B 1 / 8 sec

C 1 / 8p sec

D 1 / 10 sec

ANS:D - 1 / 10 sec

f_s = 2 f_m where f_m is the highest frequency component. so

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