Physics 6C Final Practice

# Physics 6C Final Practice - Physics 6C Final Practice...

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Physics 6C Final Practice Questions clas.ucsb.edu/staff/vince/ Use the following information for problems 1 and 2. A beam of white light with frequency between 4.00 x 10 14 Hz and 7.90 x 10 14 Hz is incident on a sodium surface, which has a work function of 2.28 eV. 1) What is the range of frequencies in this beam of light for which electrons are ejected from the sodium surface? a) 4.00 x 10 14 Hz to 7.90 x 10 14 Hz b) 4.00 x 10 14 Hz to 6.44 x 10 14 Hz c) 5.10 x 10 14 Hz to 7.90 x 10 14 Hz d) 5.50 x 10 14 Hz to 7.90 x 10 14 Hz 2) What is the maximum kinetic energy of the photoelectrons that are ejected from this surface? 3) When light of a particular wavelength and intensity shines on the surface of a given metal, no electrons are ejected. Which of the following changes will most likely cause the emission of photoelectrons? 4) What is the de Broglie wavelength for a Helium atom (atomic mass=4.002603 u) traveling at a speed of 10 3 m/s? Use the conversion factor 1 u = 1.66054 x 10 -27 kg. 5) The position of an electron is measured with uncertainty 1x10 -6 m. What is the minimum uncertainty in the electron’s velocity? Use electron mass = 9.11x10 -31 kg.

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