Change the chapter
Question
(a) On a day when the intensity of sunlight is $1.00\textrm{ kW/m}^2$, a circular lens 0.200 m in diameter focuses light onto water in a black beaker. Two polarizing sheets of plastic are placed in front of the lens with their axes at an angle of $20.0^\circ$. Assuming the sunlight is unpolarized and the polarizers are 100% efficient, what is the initial rate of heating of the water in $\textrm{C}^\circ\textrm{/s}$ , assuming it is 80.0% absorbed? The aluminum beaker has a mass of 30.0 grams and contains 250 grams of water. (b) Do the polarizing filters get hot? Explain.
1. $0.0103\textrm{ C}^\circ\textrm{/s}$
2. Since the polarizers are 100% efficient, they don't absorb any of the sunlight's energy. Therefore they do not get hot.
Solution Video