Passband to baseband conversion: Consider the following passband signal,

ypt= V2sine(2t)cos(200mt).

where sinc(t)=\frac{sin(\pi t)}{\pi t} is the sinc function.

(1) What is the carrier frequency of y_{p}(t) ?
(2) What is the absolute passband bandwidth of y_{p}(t) ?
(3) Find the complex baseband equivalent y(t) of y_{p}(t) .
(4) What is the absolute bandwidth of y(t)?

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How to increase the thermal officiency of an ideal simple rankino cycle? among these methods, which one is the best and why?