White light is composed of all the colors of the visible light spectrum. The spectrum is usually said to consist of
A) red, blue and green
B) red, yellow, blue and green
C) red, orange yellow, green, and blue
D) red, orange yellow, green, blue, and violet

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.