**Unformatted text preview: **photons fall on a square meter in 1 second? 5. Electrical wires connected to a wall plug (in the US) emit EM radiation of frequency 60 Hertz. a. What is the wavelength of that radiation? Is it visible? b. What is the energy of one photon emitted? 6. A proton travels at (1/300)c. What is its deBroglie wavelength? Mass of the proton is 1.67x10-27 Kg. 7. A hydrogen atom undergoes a transition from the n=5 to the n=2 state. What is the wavelength of the photon emitted? Is it visible? 8. An electron is confined to a microscopic tube of length 10-8 m. What is the best precision, i.e. the smallest uncertainty with which its momentum and velocity can be measured? Mass of electron is 9.11x10-31 Kg. 9. One day 2 inches of rain fell in the Boston area. How many gallons of water fell on the Tufts campus? (This is an estimation problem.)...

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