# Quiz3A - Physics 1C Spring 2010 Quiz3A Name_ h= 6.6x10 -34...

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Physics 1C Spring 2010 Quiz3A Name___________________________________ h = 6.6x10 - 34 Js, m e = 9.1x10 - 31 kg, e = 1.6x10 - 19 C, c = 3.00x10 8 m/s, eV = 1.6x10 - 19 J, Rhydberg constant = 1.097x10 7 m - 1 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) In an x - ray source, electrons accelerated through a potential of 3000 V are incident on a metal surface. The shortest wavelength x - ray emitted by the source has a wavelength of ________. A) 0.93 nm B) 0.075 nm C) 0.41 nm D) 0.62 nm 1) 2) A laser light beam with an wavelength of 450 nm is used to kill a mosquito. If the energy needed to do this is 0.20 J how many photons are necessary. A) 3x10 15 B) 5x10 17 C) 2x10 10 D) 8x10 20 2) 3) You are designing a semiconductor diode laser with a short wavelength to read more information from a dvd. To do this you need a semiconductor with _________, A) a small band gap B) a large size C) a small size D) a large band gap. 3)

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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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Quiz3A - Physics 1C Spring 2010 Quiz3A Name_ h= 6.6x10 -34...

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