- Incorrect 0 2 Pts Question 5 The Laser Illustrated In Figure 39 29 Page 1302 In The Text Would Emit Coherent Light Wit 1 (60.91 KiB) Viewed 24 times
Figure 39.29 (a), (b), (c) Stages in the operation of a four-level laser. (d) The light emitted by atoms making spontaneous transitions from state E₂ to state E₁ is reflected between mirrors, so it continues to stimulate emission and gives rise to coherent light. One mirror is partially transmitting and allows the high-intensity light beam to escape. (a) Before pumping (b) Just after pumping (c) About 10-8 s after pumping All atoms initially in ground state Some atoms in excited states Atoms in metastable state E₂ create population inversion relative to E₁. E3 Excited state with short lifetime E3 E3 < Excited state with long lifetime E2 (metastable state) Excited state E₁ with short lifetime Ground state E = 0 Atoms E2 E₁ E = 0 ● Atoms in E3 drop to E₂ or ground state. Atoms in E₁ <......... drop to E = 0 ground state. E2 E₁
Incorrect Question 6 0/2 pts The Maxwell-Boltzmann distribution (involving the function e-E/KT) gives information about the population of particles in various energy states at a given temperature. Which conclusion(s) can be drawn from this distribution? (Select all that apply.) At higher temperatures, it becomes less likely to find particles in excited states. In general, more particles are in high-energy states than in low-energy states. At higher temperatures, it becomes more likely to find particles in excited states. In general, fewer particles are in high-energy states than in low-energy states.