Ryan Tram
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Astronomy

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Ryan Tram
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Chapter 4

Question 8 of 25 Question 1 of 25

1

Why do astronomers build radio telescopes?

Select one of the following:

  • Radio waves give a different view of the universe

  • Radio waves from space reach the Earth’s surface

  • Radio telescopes can detect signals from aliens

  • Radio telescopes can be much larger than optical telescopes

Explanation

Question 19 of 25 Question 2 of 25

1

What type of telescope is most likely to suffer from chromatic aberration and have a low light-gathering power?

Select one of the following:

  • a small diameter reflecting telescope

  • a large diameter reflecting telescope

  • a small diameter refracting telescope

  • a large diameter refracting telescope

Explanation

Question 1 of 25 Question 3 of 25

1

When does chromatic aberration occur in a telescope?

Select one of the following:

  • when light of different wavelengths gets absorbed by the lens in a refracting telescope

  • when light of different wavelengths gets absorbed by the mirror in a reflecting telescope

  • when different colours of light do not focus at the same point in a refracting telescope

  • when different colours of light do not focus at the same point in a reflecting telescope

Explanation

Question 11 of 25 Question 4 of 25

1

What type of telescope is a radio telescope?

Select one of the following:

  • retracting

  • reflecting

  • deflecting

  • refracting

Explanation

Question 16 of 25 Question 5 of 25

1

What type of telescope has a lens as its objective and contains no mirrors?

Select one of the following:

  • reflecting

  • deflecting

  • refracting

  • compound

Explanation

Question 2 of 25 Question 6 of 25

1

How is the objective of most radio telescopes similar to the objective of a reflecting optical telescope?

Select one of the following:

  • They are typically the same size

  • They are both made of metal

  • They are both hill-shaped (convex)

  • They are both bowl-shaped (concave)

Explanation

Question 9 of 25 Question 7 of 25

1

What type of primary is found in a reflecting telescope?

Select one of the following:

  • lens

  • diffraction grating

  • mirror

  • prism

Explanation

Question 7 of 25 Question 8 of 25

1

You point your backyard reflecting telescope at the star Vega. Where does Vega’s light go?

Select one of the following:

  • from the primary mirror to the eyepiece

  • through the primary lens, through the secondary lens, to the eyepiece

  • from the primary mirror, to the secondary mirror, to the eyepiece

  • through the primary lens, to the secondary mirror, to the eyepiece

Explanation

Question 25 of 25 Question 9 of 25

1

Which of the following best explains the concept of atmospheric windows?

Select one of the following:

  • The Earth’s atmosphere can be “closed” or “open” to electromagnetic radiation, depending on the weather

  • X-ray radiation from space can see through the atmosphere to observe activities on the ground

  • Holes in the Earth’s atmosphere allow ultraviolet radiation to reach the North and South poles

  • Only certain wavelengths of electromagnetic radiation from space reach the Earth’s surface

Explanation

Question 10 of 25 Question 10 of 25

1

What is the main reason for building large optical telescopes?

Select one of the following:

  • It’s the best way to collect as much light as possible from faint objects

  • It’s the best way to see through clouds and other light-absorbers in the atmosphere

  • It’s the best way to nullify the blurring effects of the Earth’s atmosphere and thus produce higher resolution images

  • It’s the best way to magnify objects and make them brighter

Explanation

Question 24 of 25 Question 11 of 25

1

An astronomer takes two pictures of the same object using the Hubble Space Telescope. One picture is taken with red light and one with blue light. Which one would you expect to show finer details?

Select one of the following:

  • The amount of detail depends on the distance to the object

  • Red light will show finer details

  • Both should be the same

  • Blue light will show finer details

Explanation

Question 6 of 25 Question 12 of 25

1

Which property of a telescope determines its light-gathering power?

Select one of the following:

  • the length of the telescope tube

  • the diameter of the objective

  • the focal length of the objective

  • the focal length of the eyepiece

Explanation

Question 18 of 25 Question 13 of 25

1

What is the light-gathering power of a telescope directly proportional to?

Select one of the following:

  • the diameter of the primary mirror or lens

  • the length of the telescope tube

  • the focal length of the primary mirror or lens

  • the diameter of the eyepiece

Explanation

Question 5 of 25 Question 14 of 25

1

Why can’t a telescope image be magnified to show any level of detail?

Select one of the following:

  • Resolving power depends on wavelength

  • Telescopes only view a small region of the sky

  • Magnification depends on focal length

  • Diffraction limits the amount of detail that is visible

Explanation

Question 14 of 25 Question 15 of 25

1

Which of the following has the most light-gathering power?

Select one of the following:

  • a telescope of 6 centimeters diameter and focal length of 100 centimeters

  • a telescope of 3 centimeters diameter and focal length of 75 centimeters

  • a telescope of 2 centimeters diameter and focal length of 100 centimeters

  • a telescope of 5 centimeters diameter and focal length of 50 centimeters

Explanation

Question 15 of 25 Question 16 of 25

1

How is the resolving power of a telescope defined?

Select one of the following:

  • It is a measure of how blurry objects appear in the telescope

  • It is the separation between the objective and the image

  • It is a measure of the amount of light that the telescope can gather in one second

  • It is a measure of the minimum angular separation that can be seen with the telescope

Explanation

Question 13 of 25 Question 17 of 25

1

What happens to a telescope’s light-gathering power and resolving power when you increase its diameter?

Select one of the following:

  • Its light-gathering power decreases and its resolving power increases

  • Its light-gathering power and resolving power both decrease

  • Its light-gathering power increases and its resolving power decreases

  • Its light-gathering power and resolving power both increase

Explanation

Question 4 of 25 Question 18 of 25

1

What can be done to improve the resolving power of ground-based optical telescopes?

Select one of the following:

  • Change them from reflectors to refractors

  • Equip them with an adaptive optics system

  • Increase their focal length

  • Use them at longer wavelengths

Explanation

Question 22 of 25 Question 19 of 25

1

The pupil of the human eye is approximately 0.8 centimeters in diameter when adapted to the dark. What is the ratio of the light-gathering power of a 1.6 meter telescope to that of the human eye?

Select one of the following:

  • 400 : 1

  • 2 : 1

  • 40,000 : 1

  • 20 : 1

Explanation

Question 12 of 25 Question 20 of 25

1

What is the ratio of the light-gathering power of a 10-metre telescope to that of a 1-metre telescope?

Select one of the following:

  • 1 to 100

  • 10 to 1

  • 1 to 10

  • 100 to 1

Explanation

Question 23 of 25 Question 21 of 25

1

Click on the orange point and write the correct answer.

The diagram below illustrates the layout and light path of a reflecting telescope of the __________design

1

Explanation

Question 20 of 25 Question 22 of 25

1

Click on the orange point and write the correct answer.

A(n)___________is used to measure the brightness and colour of stars

1

Explanation

Question 3 of 25 Question 23 of 25

1

300 nanometer light has a lower frequency than 500 nanometer light

Select one of the following:

  • True
  • False

Explanation

Question 21 of 25 Question 24 of 25

1

X-rays easily penetrate the Earth’s atmosphere and reach the ground from space

Select one of the following:

  • True
  • False

Explanation

Question 17 of 25 Question 25 of 25

1

What is the purpose of interferometry?

Select one of the following:

  • It is used to decrease the chromatic aberration of a telescope

  • It is used to make large X-ray and ultraviolet telescopes

  • It is used to improve the resolving power of telescopes

  • It allows radio telescopes to be within a few hundred feet of each other

Explanation

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