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1. Solar energy strikes Earth at 343Wm2 with about 30% is reflected and the rest absorbed. The absorbed energy reradiates as a black body at

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1. Solar energy strikes Earth at 343Wm2 with about 30% is reflected and the rest absorbed. The absorbed energy reradiates as a black body at 5.67105(KT)4Wm2, where T is the temperature in K. At equilibrium calculate the temperature of the Earth. 2. A metal surface with a work function of 2.5eV is irradiated with 4J of energy at 300nm. a. How many total electrons are emitted? b. What is their kinetic energy in J and their velocity in ms1 ? c. What is their de Broglie wavelength? 1. Solar energy strikes Earth at 343Wm2 with about 30% is reflected and the rest absorbed. The absorbed energy reradiates as a black body at 5.67105(KT)4Wm2, where T is the temperature in K. At equilibrium calculate the temperature of the Earth. 2. A metal surface with a work function of 2.5eV is irradiated with 4J of energy at 300nm. a. How many total electrons are emitted? b. What is their kinetic energy in J and their velocity in ms1 ? c. What is their de Broglie wavelength

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