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Unformatted text preview: (c) What would be the stopping potential if the incident light had a wavelength of 430 nm? (d) What is the threshold wavelength for the photoelectric e f ect with potassium? [4] A hydrogen atom is in its tenth excited state according to the Bohr model (n=11). (a) What is the radius of the Bohr orbit? (b) What is the angular momentum of the electron? (c) What is the electron’s kinetic energy? (d) What is the electron’s potential energy? (e) What is the electron’s total energy? [5] A certain radio station broadcasts at a frequency of 5 MHz with an average power output of 5 kW. (a) What is the energy of a photon in electronvolts? (b) How many photons does the station emit per second? (c) Why are quantum e f ects not observed in radio transmission at this frequency? 1...
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This note was uploaded on 04/07/2008 for the course PHY 113 taught by Professor Jordan during the Spring '08 term at Rochester.
 Spring '08
 Jordan
 Energy, Work

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