I have to submit a physics project in my college, is there any theory that can be proved, or any other similar thing using the ephemeris of a satellite? or any other good project idea that doesn't consume too much time.
I'm finding problem understanding your question, what i know is that the path difference = d sinθ
and for constructive interference d sinθ =n λ
where n is an integer.
usually when we talk about heat engine, it gets all the energy needed in the form of heat, so the formula η= W/Qin is used, but in your case i think that the formula that you gave should be used.(i'm not sure)