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Serway_CP_poll_ch28 - An energy of 13.6 eV is needed to...

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An energy of 13.6 eV is needed to ionize an electron. From the ground state of a hydrogen atom, what wavelength is needed if a photon accomplishes this task? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 60 nm 2. 70 nm 3. 80 nm 4. 90 nm
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A photon is emitted from a hydrogen atom that undergoes a transition from n = 3 to n = 2. Calculate the energy and wavelength of the photon. 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. E g = 1.89 eV, λ = 658 nm 2. E g = 2.21 eV, λ = 563 nm 3. E g = 2.70 eV, λ = 460 nm 4. E g = 3.19 eV, λ = 390 nm
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A ruby laser can deliver an 8.57 J pulse in approximately 50 nanoseconds. The wavelength of the light is 694.4 nm. How many atoms within the ruby rod had to be excited to allow this high-energy laser pulse? (h = 6.626 x 10 -34 J-s) 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 4 x 10 18 2. 8 x 10 18 3. 3 x 10 19 4. 6 x 10 20
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A ruby laser delivers a 10 ns pulse of 1 MW average power. If all the photons are of wavelength 694.3 nm, how many photons are contained in the pulse? (h = 6.626 x 10 -34 J-s) 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 5.0 x 10 15 2. 2.0 x 10 16 3. 3.5 x 10 16 4. 5.0 x 10 16
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The energy needed to change an He + ion into an He ++ ion is? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 13.6 eV. 2. 54.4 eV. 3. 92.9 eV. 4. 112.4 eV.
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A hydrogen atom in the ground state absorbs a 12.1 eV photon. To what level is the electron promoted? (The ionization energy of hydrogen is 13.6 eV) 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. n = 2 2. n = 3 3. n = 4 4. n = 5
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The wavelength of coherent ruby laser light is 694.3 nm. What energy difference (in eV) exists between the upper excited state and the lower unexcited ground state? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 1.646 eV 2. 1.789 eV 3. 1.812 eV 4. 1.936 eV
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If an electron has a spin of 3/2 its spin quantum number, ms, could have the following four values: m s = +3/2, +1/2, -1/2, and -3/2. If this were true, the first element with a filled shell would be the first of the noble gasses and it would be? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. He with 2 electrons. 2. Li with 3 electrons. 3. Be with 4 electrons. 4. C with 5 electrons.
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In an X-ray machine, electrons are accelerated and then fired so that they are incident on a metal target. Which part of the process produces the characteristic X-ray spectra? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. The incident electron loses energy.
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