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Understanding the basic concepts in optics.

1. Which of the following types of electromagnetic radiation has the greatest energy?
a) X-rays
b) Visible light
c) Infrared radiation
d) gamma-rays
e) Radio

2. Astronomers build optical telescopes on tops of mountains since
a) There is less air to dim the light.
b) The seeing is better.
c) CCDs work better when there is less oxygen in the air.
d) all of the above
e) A and B

3. A nanometer is
a) a unit of resolving power.
b) a unit of energy.
c) a unit of length.
d) a unit of light-gathering power.
e) a unit of mass.

4. The _____ of a telescope is a measure of its ability to show fine detail and depends on the diameter of the objective.
a) Focal length
b) Resolving power
c) Magnifying power
d) light-gathering power
e) Chromatic aberration


5._____ has (have) wavelengths that are shorter than visible light. I. Gamma-rays II. Ultraviolet light III. Infrared radiation IV. X-rays
a) I & II
b) I & IV
c) II & III
d) II, III, & IV
e) I, II, & IV

6. Which types of electromagnetic radiation can be seen from the surface of Earth?
a) Gamma rays and X-rays
b) Infrared and Ultraviolet
c) Visible light and Infrared
d) Infrared light and Radio waves
e) Visible light and Radio waves

7. Why are most modern telescopes reflecting telescopes?
a) Lenses can easily break.
b) CCD cameras only work on reflecting telescopes.
c) Only visible light can be refracted.
d) Mirrors are easier to build.
e) None of the above

8. A typical amateur telescope is 7 inches in diameter, while the telescope we are installing at CSU Stanislaus is 21 inches in diameter. How much more sensitive is the CSU telescope than a typical amateur telescope?
2 times
3 times
6 times
9 times
12 times

9. The temperature of an object from which no heat energy could be extracted is
a) 100 degrees Kelvin
b) 0 degrees Kelvin
c) 100 degrees Centigrade
d) 0 degrees Centigrade
e) 0 degrees Fahrenheit

10. A neutral hydrogen atom consists of
a) One proton.
b) One proton and one electron.
c) One proton, one neutron, and one electron.
d) An isotope and an ion.
e) One proton and one neutron.

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  • Category:- Physics
  • Reference No.:- M917056

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