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Serway_CP_poll_ch30 - How much kinetic energy must a...

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How much kinetic energy must a deuterium ion (charge = 1.6 x 10 -19 C) have to approach within 10 -14 m of another deuterium ion? [k = 9 x 10 9 N-m 2 /C 2 and 1 MeV = 1.6 x 10 -13 J] 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. 30 KeV 2. 50 KeV 3. 70 KeV 4. 140 KeV
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How fast is an ion of deuterium moving if it is in a plasma with a temperature of 10 8 K? (k B = 1.38 x 10 -23 J/K and m D = 2 x 1.66 x 10 -27 kg) 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. 1.12 x 10 6 m/s 2. 0.93 x 10 5 m/s 3. 0.46 x 10 5 m/s 4. 2.32 x 10 4 m/s
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One in 6500 water molecules (on average) contains a deuterium atom. If all the deuterium could be extracted from 1 m 3 of water and then reacted, how much energy could be obtained? (Each D-D fusion liberates 3.65 MeV of energy, 1 MeV = 1.6 x 10 -13 J) 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. 8.0 x 10 10 J 2. 9.6 x 10 10 J 3. 4.8 x 10 11 J 4. 1.5 x 10 12 J
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The reason that a thermonuclear fusion reaction cannot be maintained in the oceans of the earth is because? 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 temperature is not high enough. 2. the density is not high enough. 3. there is insufficient deuterium in the ocean. 4. the deuterium in the ocean is not radioactive.
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The tokamak is used instead of the walls of a container to confine a plasma for nuclear fusion because, if the plasma touched the walls of a container, the nuclear fusion reaction would have to stop because? 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 plasma would become cooler. 2. the plasma would melt the walls. 3. the walls would become radioactive. 4. the walls would not be strong enough to contain the plasma.
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The formation of a star requires the consideration of the effects of gravity and the energy from nuclear reactions and a star will form only when both the temperature and density are sufficiently high. In the birth of a star, 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. gravity produces the initial required high temperature and density. 2. nuclear reactions produce the initial high temperature. 3. nuclear reactions produce the initial required high density. 4. nuclear reactions produce the initial required high temperature and density.
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Which of the following is not true of neutrinos? 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. spinless 2. chargeless 3. massless 4. lepton
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Which of the following particle reactions cannot occur?
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