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Chapter 7 – Lecture Example Problems 1. A Wavelength of violet light is 410nm. a. What is the frequency of this wavelength? b. What is the energy of this wavelength? 2. How many photons are generated by an 800. Watt microwave oven that operates for 60.0 seconds at a wavelength of 0.010m? 3. It requires 280 kJ per mole of Lithium atoms to remove one mole of electrons from the surface of Lithium metal. What minimum wavelength of light is required to do this? 4. What wavelength of light is generated when a Hydrogen electron fall from the n=3 to the n=2 energy level? 5. Calculate the deBroglie wavelength of: a. A baseball (0.145 kg) traveling at 95 mph (42 m/s). b. An electron in an electron microscope accelerated to a speed of 9.0 x 106 m/s. 6. Calculate the minimum Heisenburg uncertainty in the position of: a. A 25.0g bullet fired with a muzzle velocity of 550 m/s. b. An electron moving at 2.2 x 106 m/s around the Hydrogen atom. 7. For the quantum levels of n=1 and n=2, provide all of the possible sets of four unique quantum numbers. 8. Integrative Exercise: How many photons would be absorbed by 325mL of coffee that is heated from 22.3oC to 45.5oC in a microwave oven? The microwave operates at 12.4 cm, the density of the coffee is 0.997g/mL, and the specific heat of the coffee is 4.184 J/goC.