ast ch 02 ques v. 02

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Astronomy : A Self-Teaching Guide Ch. 02 : Light and Telescopes 1. How can light be modeled? 2. Define : Frequency 3. Sketch a wave. Include crest, trough, and wavelength. 4. What is the wavelength range of human vision? 5. List three forms of “long” and “short” wavelength electromagnetic radiation. Long Short 6. How many miles does one light year equal?

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Page 1: Ast Ch 02 Ques V. 02

Astronomy: A Self-Teaching GuideCh. 02: Light and Telescopes

1. How can light be modeled?

2. Define : Frequency

3. Sketch a wave. Include crest, trough, and wavelength.

4. What is the wavelength range of human vision?

5. List three forms of “long” and “short” wavelength electromagnetic radiation.

Long Short

6. How many miles does one light year equal?

7. How long does light from the Andromeda Galaxy take to reach our eyes?

8. Complete the telescope chart:

Telescopes Refracting Reflecting Compound

Optics

Page 2: Ast Ch 02 Ques V. 02

9. Matching:

_____ Objective a) Assembly of small magnifying lenses, forms the image viewed through a telescope

_____ Aperture b) Diameter of the objective, determines amount of light gathered by the scope

_____ Eyepiece c) Distance from the objective to the image in the eyepiece

_____ Focal length d) Main mirror or lens

10. What magnification is produced by a 32mm eyepiece used with a 2000mm focal length Schmidt-Cassegrain telescope?

11. What is the highest useful magnification of a 6-inch reflecting telescope?

12. What is the focal length of a 6-inch (150 mm), f/8 reflecting telescope?

13. What magnification would be produced when using the 6-inch scope mentioned above with a 32mm eyepiece?

14. Telescopes advertised as having high ____________________ are meant to deceive consumers

because ____________________ is the true way to access a telescope’s ability to show objects in

the sky.

15. If the mirror in our 6-inch scope had a defect, what might it be?

16. What is the aperture and magnification of a pair of 15x80 binoculars?

17. What is the term for the steadiness of the earth’s atmosphere over a given surface?

18. What is an observatory?

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