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Q. A photon with a wavelength 4.40 scatters from an electron initially at rest. Find the wavelength of the scattered photon when the scattered electron has its maximum kinetic energy. Kmax = 2.37*20^-14.

Q. An electrical generating plant operates at a boiler temperature of 220^{circ}C and exhausts the unused heat into a nearby river at 19^{circ}C. If the generating plant has a power output of 800 megawatts (MW) and if the actual efficiency is 3/4 the theoretical efficiency, how much heat per second must be delivered to the boiler? (0^{circ}C = 273 K).

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