You have two lightbulbs of different power and color, as indicated in (Figure 1). One is a 150-WW red bulb, and the other is a 40-WW blue bulb. Which bulb emits more photons per second? Which bulb emits photons of higher energy? Calculate the number of photons emitted per second by each bulb. Take λred=640nm�red=640nm and λblue=430nm�blue=430nm. (Most of the electromagnetic radiation given off by incandescent lightbulbs is in the infrared portion of the spectrum. For the purposes of this problem, however, assume that all of the radiated power is at the wavelengths indicated.)

A sodium surface is illuminated with 384-nm light. (a) Determine the energy of each photon in joules. (Enter your answer to at least four significant figures.) (b) Determine the energy of each photon in electron volts. (Enter your answer to at least three decimal places.) ev (c) Determine the maximum kinetic energy in electron volts of the ejected photoelectrons. ev

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As you may well know, placing metal objects inside a microwave oven can generate sparks. Two of your friends are arguing over the cause of the sparking, with one stating that the microwaves "herd" electrons into "pointy" areas of the metal object, from which the electrons jump from one part of the object to another. The other friend says that the sparks are caused by the photoelectric effect. Prove or disprove the latter idea using basic physics. Suppose the typical work function of the metal is roughly 3.630 × 10-19 J. Calculate the maximum wavelength in angstroms of the radiation that will eject electrons from the metal. wavelength: Å