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f09final

# 14 c decays to 14 n the particle

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Unformatted text preview: eflection possible for light rays traveling from air to liquid, from liquid to air, or both? (2 pts) b. Does total internal reflection occur for incident angles of 30° or more, 30° or less, or only for precisely 30°? (2 pts) c. Determine the index of refraction of the liquid. (3 pts) Name__________________________________ 21. The capacitor in the circuit at right is initially uncharged. a. The switch is moved to position 1. On the axes below sketch a graph of the current measured by CP1 as a function of time. (Note the zero of the current axis is in the middle, as marked.) (2 pts) b. After a while, the switch is moved to position 2. Sketch a graph of the voltage measured by VP2 as a function of time. (Note the zero of the current axis is in the middle, as marked.) (2 pts) 22. For the circuit at right, the switch is initially open (as shown). a. Rank the bulbs in order from brightest to dimmest. If two bulbs have the same A brightness, indicate that explicitly. (2 pts) B Now the switch is closed. b. Rank the bulbs in order from brightest to dimmest. If two bulbs have the same brightness, indicate that explicitly. (3 pts) D C c. What happens to the brightness of bulb A when the switch is closed? Explain. (3 pts) Name__________________________________ 23. For the circuit at right, a. Find the current through the 12 Ω resistor. (3 pts) 12 V b. Find the current through the 6.0 Ω resistor. (3 pts) c. Find the power delivered by the battery. (3 pts) 24. At right is a picture of an interference pattern resulting from laser light passing through two narrow slits 0.50 mm apart (1 mm = 10 ­3 m). The distance between the arrows on the screen is 4.0 mm and the screen is 2.0 m away from the slits. What’s the wavelength of the laser light, in nm? (1 nm = 10 ­9 m) (7 pts) 12 Ω 6.0 Ω Central maximum Name__________________________________ 25. An isotope of thorium, 2340Th , undergoes alpha decay. (2 pts) 9 a. What would be the number of protons in the daughter nucleus? € b. What would be the number of total number of nucleons in the daughter nucleus? 26. The first three energy levels of a fictitious atom are E1 =  ­20 eV, E2 =  ­8.0 eV, and E3 =  ­2.0 eV. Light consisting of photons of a wide range of energies – from near zero to more than 20 eV – shines on a gas of these atoms. a. Determine the energies of photons that will be absorbed by the gas. (2 pts) b. Determine the energies of photons in the emission spectrum of these atoms. (2 pts) 27. Light of a single wavelength shines on a metal which has a work function of 3.0 eV. Photoelectrons with kinetic energy of up to 5.0 eV are emitted. a. What energy or range of energies do the incident photons have? (3 pts) b. If the intensity of the incident light increases, does the maximum kinetic energy of photoelectrons go up, go down, or stay the same? Explain. (2 pts) c. If instead the wavelength of the light increases, does the maximum kinetic energy of photoelectrons go up, go down, or stay the same? Explain. (2 pts)...
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