3. Two baseband signals m (t) and m (t) has bandwidths 15 kHz and 25 kHz respectively. The sampling rate of 80,000 samples/sec will be the Nyquist rate of A. m (t) + m (t) B. m(t) x m (t) C. m (t) * m (t); the convolution between the two signals D. m(t) + m(t) E. 2m (t) + 2m (t) 4. Given a signal m(t) with bandwidth limited to 20kHz. The Nyquist sampling rate for m(t) is dt A. 20 kHz B. 40kHz C.Hz 40k D. 40kHz E. 10 kHz 5. If the signal x()=cos(280) was sampled with sampling frequency fs and the reconstructed signal using a lowpass filter with cut off frequency is given by cos (200), then the sampling frequency, f, is ........... Hz. 2 A. 240 Hz B. 280 Hz C. 140 Hz D. 200 Hz E. 230 Hz