A sample of an ideal gas is taken through the cyclic process abca shown in Fig. 19-20. The scale of the vertical axis is set by Pb = 7.5 kPa and Pac = 2.5 kPa. At point a, T = 200 K. (a) How many moles of gas are in the sample? What are (b) the temperature of the gas at point b, (c) the temperature of the gas at point c, and (d) the net energy added to the gas as heat during the cycle?
Chapter 30: Quantum Physics The “ideal” blackbody absorbs all the light that is incident upon it and is an ideal radiator The distribution of energy in blackbody radiation is independent of the material from which the blackbody is constructed — it depends only on the temperature, T Classical predictions were that the intensity increased rapidly with frequency, hence the ultraviolet catastrophe. Planck’s constant is a very tiny number; this means that the quantization of the energy of blackbody radiation is imperceptible in most macroscopic situations A more intense beam of light will contain more photons, but the energy of each photon does not change The photoelectric effect occurs when a beam of light strikes a metal
