Solar cells are given antireflection coatings to maximize their efficiency. consider a silicon solar cell (n=3.50)coated with a layer of silicon dioxide (n=1.45). what is the minimum coating thickness (but not zero) that will minimize the reflection at the wavelength of 697 nm where solar cells are most efficient?

An air standard cycle with variable specific heats is executed in a closed system and is composed of the following four processes. 1-2 isentropic compression 100 kpa and 22°c to 600 kpa 2-3 v=constant heat addition to 1500 k 3-4 isentropic expansion to 100 kpa 4-1 p=constant heat rejection to initial state (a) show the cycle on p-v and t-s s (b) calculate the net work output per unit mass (409 kj/kg) (c) determine the thermal efficiency (47.9%)