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# finalstuff - 12. Light with a wavelength of 340 nm is...

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12 . Light with a wavelength of 340 nm is incident on a metal surface and ejects electrons with a maximum energy of 1.2 eV. What is the work function, , of the surface? a. 1.2 eV. ***b. 2.5 eV. c. 3.7 eV. d. 5.8 eV. e. 1.9 eV. 19 . Two cars, with equal ground speeds, are moving in opposite directions away from each other on a straight highway. One driver blows a horn with a frequency of 111 Hz; the other observes the frequency as 105 Hz. If the speed of sound is 338 m/s, what is the ground speed of each car? a. 3.20 m/s. ***b. 9.39 m/s. c. 11.9 m/s. d. 17.4 m/s. e. 18.3 m/s. 21 . An electron and a neutron have the same de Broglie wavelength. Which one of the following statements regarding this situation is true? ***a. The electron has more kinetic energy and a higher speed. b. The electron has less kinetic energy but a higher speed. c. The electron has less kinetic energy and a lower speed. d. The electron and the neutron have the same kinetic energy but the electron has a

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## This note was uploaded on 02/11/2012 for the course PHYS 1C 1C taught by Professor Wethien during the Spring '11 term at UCSD.

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finalstuff - 12. Light with a wavelength of 340 nm is...

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