Physics 101 - Homework 3

Instructions: Complete this form and click submit. The answers will be posted on the course home page after the due date and before the next exam. If you want to change any of your answers after you click submit, then go back and give your answers again and click submit.

Your Name:	e.g. John Doe
Your Campus ID:	e.g. 12345678
Your SFA Email Address:	e.g. doejd@titan.sfasu.edu
Due Date	10/10/2007 5:00PM

1. Which list is in order of increasing wavelength? a) blue, red, x-ray, ultraviolet b) ultraviolet, x-ray, blue, red c) x-ray, ultraviolet, red, blue d) x-ray, ultraviolet, blue, red 2. The sensation of color is seen when light falls on the eye's a) rods. b) cones. c) optic nerve. d) cornea. 3. The blind spot of the human eye results from a) rods attached to the retina. b) cones attached to the fovea. c) a detached retina. d) the optic nerve attached to the retina. e) color blindness. 4. At the same time an astronaut on the Moon sees a solar eclipse, observers on the Earth a) also see a solar eclipse. b) see a full Moon. c) see the Sun pass behind the Moon. d) see the Moon in the Earth's umbra. e) see Europa be eclipsed by Jupiter. 5. Light is emitted from atoms when an electron a) is boosted to a higher energy level. b) makes a transition to a lower energy level. c) is in a circular orbit around the nucleus. d) none of these. 6. If a light signal and a radio signal were emitted simultaneously from Alpha Centauri, which would reach the Earth first? a) the radio signal. b) the light signal. c) both would reach Earth at the same time. d) neither would reach the Earth since these electromagnetic waves cannot travel in the vacuum of space. e) not enough information is given. 7. Some minerals absorb ultraviolet light and then release lower energy visible light. This process is called a) fluorescence. b) atomic resonance. c) incandescence. d) phosphorescence. 8. The filament of an incandescent light bulb is a hot solid. Passing the light from a hot solid through a prism will result in… a) an Emission Spectrum. b) a Continuous Spectrum. c) an Absorption Spectrum. 9. The neon gas inside a neon sign is a hot gas. Passing the light from a hot gas through a prism will result in… a) an Emission Spectrum. b) a Continuous Spectrum. c) an Absorption Spectrum. 10. Stars are hot objects surrounded by cooler gasses. Passing the light from a star through a prism will result in… a) an Emission Spectrum. b) a Continuous Spectrum. c) an Absorption Spectrum.

11. Light has a maximum constant speed in a) between the atoms in glass, water, or the atmosphere. b) red glass. c) water. d) the upper atmosphere. e) clear glass. 12. When the shadow of the moon falls upon the Earth, those in the shadow experience a) a solar eclipse if in the day, and a lunar eclipse if in the night. b) a lunar eclipse. c) actually both if conditions are right. d) a solar eclipse. e) None of these. 13. Which of the following is not part of the family of electromagnetic radiation? a) Visible light. b) Radio waves. c) X rays. d) Microwaves. e) None, for all belong to the same family. 14. If green light causes a substance to fluoresce, the color emitted can be a) blue. b) red. c) Either of these. d) None of these. 15. The difference between fluorescence and phosphorescence involves a) a time delay. b) whether or not radioactive materials are present. c) bioluminescence. d) relative sensitivities to excitation. e) different pigments. 16. Light from a laser is a) in phase. b) monochromatic. c) coherent. d) All of these. e) None of these.

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