1.

Let \(x\left( t \right) = \;cos10\pi t + \cos \left( {30\pi t} \right)\) be sampled at 20Hz and reconstructed using an ideal LPF with fc of 20Hz. The frequency/frequencies present in reconstructed signal is/are

A. 5 Hz, 15 Hz only
B. 15 Hz only
C. 5 Hz only
D. 5, 10, 15 Hz only
Answer» B. 15 Hz only


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