Pick the keyword from the given list: A device working on the principle of amplification by stimulated emission of radiation .

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1. With what kind of “light” (e-m radiation) can we excite electrons to very high energy states, from which they will fall down in several steps – thereby making a material fluoresce in visible light? a. microwaves. b. sub-millimeter waves. c. radio waves. d. IR. e. UV. 2. Electrons inside elements can be in certain, well-defined excited states (quantum levels). When they leave such a state to a lower energy state, the frequency f of the “light” (electromagnetic radiation) emitted is related to the energy difference ΔE between such two states as: a.an undefined quantity. b. the same as a black-body emitter. c. the same as a gravitational field. d. ΔE = h · f , where h is Planck’s constant. e. related via the equation c = c2 3. About a decade later, using his oil droplet experiment, Millikan was able to find the smallest possible charge on such droplets, which he interpreted as the charge of a single electron. With that and the m/e ratio above, he was…

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Chapter 9, Problem NM

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Pick the keyword from the given list: A device working on the principle of amplification by stimulated emission of radiation.

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1. With what kind of “light” (e-m radiation) can we excite electrons to very high energy states, from which they will fall down in several steps – thereby making a material fluoresce in visible light? a. microwaves. b. sub-millimeter waves. c. radio waves. d. IR. e. UV. 2. Electrons inside elements can be in certain, well-defined excited states (quantum levels). When they leave such a state to a lower energy state, the frequency f of the “light” (electromagnetic radiation) emitted is related to the energy difference ΔE between such two states as: a.an undefined quantity. b. the same as a black-body emitter. c. the same as a gravitational field. d. ΔE = h · f , where h is Planck’s constant. e. related via the equation c = c2 3. About a decade later, using his oil droplet experiment, Millikan was able to find the smallest possible charge on such droplets, which he interpreted as the charge of a single electron. With that and the m/e ratio above, he was…

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