Cypress College ASTR 116 Homework
Astronomy 116, Homework CHAPTER 2 (A) Light and Matter. Due:
Print Last, First Name and date on the small Scantron in INK. Print
your last name in BIG BLOCK letters on the back of the Scantron.
Use a No. 2 pencil to fill out Scantron. Read the chapter.
Look at the videos and simulations in the CD-ROM. Answer all True/False and
Fill in the Blank questions. Then answer the following questions and
turn in your Scantron only. Choose the best answer.
1. A wave's frequency triples. By what factor is its wavelength
changed?
- a) three
- b) one (no change)
- c) one third
- d) one ninth
2. Unlike the gravitational force, the electrical force:
- a) decreases with an inverse cube law
- b) is always repulsive
- c) can be repulsive as well as attractive
- d) can not produce waves
3. Light waves differ fundamentally from either water waves or sound waves
because:
- a) They do not require a material medium.
- b) They have various wavelengths.
- c) They do not travel from place to place instantaneously.
- d) The amplitude of light never changes.
4. Colors are perceived differently by our eyes because of their different:
- a) Speeds.
- b) Frequencies.
- c) Particles.
- d) Magnetism.
- e) Amplitudes.
5. Two forms of electromagnetic radiation that penetrate Earth's atmosphere
are:
- a) X-rays and visible light.
- b) Gamma rays and radio waves.
- c) Visible light and radio waves.
- d) Gamma rays and X-rays.
6. The frequency at which the intensity of a star's light peaks depends
on the _____ of the star. (Fill in the blank.)
- a) Size
- b) Temperature
- c) Magnetism
- d) Speed toward or away from the observer
- e) Strength of gravity
7. What is spectroscopy?
- a) An analysis of the way in which atoms absorb and emit light.
- b) An observational technique used to measure the brightness of
light.
- c) An observing technique that electronically records many images
of stars and is much more efficient than photography.
- d) A method used to increase the resolution of images and remove
the blurring effects of the Earth's atmosphere.
8. Suppose you are experimenting with the spectrum produced by heated hydrogen
gas. If you double your quantity of hydrogen and examine the resulting
spectral lines, what would you expect to have changed?
- a) The intensity of the lines.
- b) The wavelengths of the lines.
- c) The number of lines seen.
- d) The pattern made by the lines.
9. If an object is moving toward you, what effect do you observe in the
spectrum of that object?
- a) It appears red-shifted.
- b) The light appears to be moving faster.
- c) All the spectral lines appear broadened.
- d) It appears blue-shifted.
- e) The light appears brighter.
10. Which element contains only one proton?
- a) Helium
- b) Iron
- c) Carbon
- d) Hydrogen
- e) none of these