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Title: Which of the following devices use lasers? Post by: timothyy5 on Feb 23, 2018 Which of the following devices use lasers?
a. DVD players b. fiber optics communication systems c. photocopiers d. UPC price scanners [Ques. 2] In which of the following energy level transitions for a hydrogen atom is a photon emitted? a. n = 1 to n = 2 b. n = 3 to n = 2 c. n = 2 to n = 1 d. n = 1 to n = 4 e. n = 4 to n = 3 [Ques. 3] According to the Pauli Exclusion Principle for n = 4, the occupation limit of electrons is a. 4 b. 8 c. 16 d. 32 [Ques. 4] The red line in the helium spectrum is closer to orange than the red line in the hydrogen spectrum, indicating that it has a higher frequency. Therefore, the photons of red light emitted by helium have __________ energy than those emitted by hydrogen. a. lower b. higher c. the same d. more ionization [Ques. 5] A population inversion is a circumstance within a laser system in which there are ______ atoms with their electrons in an upper excited state than in a specific preferred lower state. a. more b. fewer c. the same amount d. ionized [Ques. 6] The Balmer series of emission lines from hydrogen lie in the ________ part of the EM spectrum. a. near infrared b. infrared c. visible d. ultraviolet [Ques. 7] The energy of a photon that ionizes a hydrogen atom from the ground state will be _________ the energy of a photon that ionizes a different hydrogen atom from the first excited state (n 2). a. larger than b. smaller than c. equal to d. twice [Ques. 8] How small an object can a scanning tunneling microscope see? a. about the size of a mushroom spore b. about the size of a living cell c. as small as a single atom d. as small as the nucleus of an atom [Ques. 9] The aurora borealis (northern lights) are caused by a. sunlight reflecting from polar ice. b. emissions from atoms and molecules in the upper atmosphere excited by electrons from the Sun. c. thunderstorms. d. an unknown process. [Ques. 10] Lasers are used a. to produce holograms. b. in surgery. c. to measure distances between objects accurately. d. in DVD and compact disc players. e. all of the above Title: Which of the following devices use lasers? Post by: oksanamad on Feb 23, 2018 Title: Which of the following devices use lasers? Post by: timothyy5 on Feb 23, 2018 Love when things are free, so much better than CourseHero
Title: Which of the following devices use lasers? Post by: oksanamad on Feb 23, 2018 tell your friends and feel free to ask more questions
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