Question 1

Violet light has a wavelength of approximately _______.

Accepted Answer

A)   400 nm
B)   4000 nm
C)   7000 nm
D)   700 nm
E)   3 × 108 mF) A) and C)
G) B) and E)

Question 2

To keep a telescope fixed on a stellar target over time as Earth rotates, the telescope must have a/an _____________________.

Accepted Answer

The answer of To keep a telescope fixed on a...

Question 3

Assume you are not near any X-ray machines. If your eyes could only see in X-rays, what color would best describe your view of your surroundings?

Accepted Answer

A)   white
B)   red
C)   violet
D)   blackE) B) and D)
F) None of the above

Question 4

What are sources of light pollution and how do those affect astronomical observations?

Accepted Answer

Sources of light pollution are...

Question 5

Spectrographs use a prism or a grating to spread starlight according to wavelength.

Accepted Answer

A) True 
 B)False

Question 6

How do atmospheric windows limit observations made from Earth's surface?

Accepted Answer

Because the atmosphere is opaq...

Question 7

Chromatic aberration occurs in a ________ telescope when __________.

Accepted Answer

A)   reflecting; different colors of light do not focus at the same point
B)   refracting; different colors of light do not focus at the same point
C)   reflecting; light of different wavelengths get absorbed by the mirror
D)   refracting; light of different wavelengths get absorbed by the lensE) None of the above
F) C) and D)

Question 8

___________ is absorbed by ozone in Earth's atmosphere that is located between 20 km and 40 km above Earth's surface. Therefore, telescopes to observe this radiation must be placed in space.

Accepted Answer

A)   Infrared radiation
B)   Ultraviolet radiation
C)   Radio wave radiation
D)   X-ray radiation
E)   Visible lightF) A) and E)
G) A) and C)

Question 9

Which kind of telescope is shown and where is it located?

Accepted Answer

A)   optical, ground
B)   radio, space
C)   radio, ground
D)   optical, spaceE) B) and D)
F) B) and C)

Question 10

An achromatic lens

Accepted Answer

A)   is used to correct spherical aberration in reflecting telescopes.
B)   is used to correct chromatic aberration in refracting telescopes.
C)   is used to correct spherical aberration in refracting telescopes.
D)   is used to correct chromatic aberration in reflecting telescopes.
E)   contains two mirrors and focuses the light back through the primary mirror.F) A) and B)
G) All of the above

Question 11

The optical shape of segmented mirrors is controlled by computer-driven thrusters under the mirrors in what is called

Accepted Answer

A)   an achromatic lens.
B)   active optics.
C)   a Schmidt-Cassegrain design.
D)   a Newtonian design.
E)   interferometry.F) C) and D)
G) A) and B)

Question 12

If you focus a store-bought telescope at the full Moon on a typical clear night, the full Moon will be viewed as _________________.

Accepted Answer

A)   right-side up
B)   upside down
C)   a dot in the sky
D)   the color redE) A) and B)
F) B) and C)

Question 13

A ___________ has a few million light-sensitive diodes in an array typically about a half-inch square.

Accepted Answer

A)   photometer
B)   charge-coupled device
C)   spectrograph
D)   photographic plate
E)   gratingF) D) and E)
G) None of the above

Question 14

Which kind of telescope and which instrument or technique are shown?

Accepted Answer

A)   optical, CCD
B)   infrared, array detector
C)   optical, adaptive optics
D)   radio, interferometryE) C) and D)
F) None of the above

Question 15

If the magnification of a telescope can be changed simply by exchanging eyepieces, why wouldn't you just magnify objects to very large sizes by choosing an appropriate eyepiece?

Accepted Answer

Because the magnifying power of a telesc...

Question 16

A wave on a lake is found to have a wavelength of 2 m and a frequency of 0.3 Hz. What is the speed of this wave?

Accepted Answer

The answer of A wave on a lake is found...

Question 17

A ______________ is an array of electromagnetic radiation and a ___________ is an instrument that spreads light according to color.

Accepted Answer

A)   prism, mirror
B)   lens, grating
C)   rainbow, prism
D)   spectrum, spectrographE) All of the above
F) None of the above

Question 18

The ____________________ is a measure of the finest detail that can be seen in an image.

Accepted Answer

The answer of The ____________________ is a measure of the...

Question 19

The energy of a photon

Accepted Answer

A)   is proportional to the wavelength of the light.
B)   is inversely proportional to the wavelength of the light.
C)   depends only on the speed of the light.
D)   depends only on the mass of the photon.
E)   depends on both the mass and speed of the photon.F) B) and D)
G) C) and D)

Question 20

A larger-primary lens shows ____________ a smaller-primary lens.

Accepted Answer

A)   more detail than
B)   less detail than
C)   the same amount of detail asD) All of the above
E) None of the above

Exam 5: Light and Telescopes

The optical shape of segmented mirrors is controlled by computer-driven thrusters under the mirrors in what is called

Correct AnswerverifiedShow Answer

Assume you are not near any X-ray machines. If your eyes could only see in X-rays, what color would best describe your view of your surroundings?

Correct AnswerverifiedShow Answer

A wave on a lake is found to have a wavelength of 2 m and a frequency of 0.3 Hz. What is the speed of this wave?

Correct AnswerverifiedShow Answer

A larger-primary lens shows ____________ a smaller-primary lens.

Correct AnswerverifiedShow Answer

Which kind of telescope is shown and where is it located?

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A ___________ has a few million light-sensitive diodes in an array typically about a half-inch square.

Correct AnswerverifiedShow Answer

What are sources of light pollution and how do those affect astronomical observations?

Correct AnswerverifiedSources of light pollution are...View AnswerShow Answer

Spectrographs use a prism or a grating to spread starlight according to wavelength.

Correct AnswerverifiedShow Answer

The energy of a photon

Correct AnswerverifiedShow Answer

Violet light has a wavelength of approximately _______.

Correct AnswerverifiedShow Answer

How do atmospheric windows limit observations made from Earth's surface?

Correct AnswerverifiedBecause the atmosphere is opaq...View AnswerShow Answer

An achromatic lens

Correct AnswerverifiedShow Answer

Which kind of telescope and which instrument or technique are shown?

Correct AnswerverifiedShow Answer

If the magnification of a telescope can be changed simply by exchanging eyepieces, why wouldn't you just magnify objects to very large sizes by choosing an appropriate eyepiece?

Correct AnswerverifiedBecause the magnifying power of a telesc...View AnswerShow Answer

The ____________________ is a measure of the finest detail that can be seen in an image.

Correct AnswerverifiedShow Answer

If you focus a store-bought telescope at the full Moon on a typical clear night, the full Moon will be viewed as _________________.

Correct AnswerverifiedShow Answer

___________ is absorbed by ozone in Earth's atmosphere that is located between 20 km and 40 km above Earth's surface. Therefore, telescopes to observe this radiation must be placed in space.

Correct AnswerverifiedShow Answer

To keep a telescope fixed on a stellar target over time as Earth rotates, the telescope must have a/an _____________________.

Correct AnswerverifiedShow Answer

Chromatic aberration occurs in a ________ telescope when __________.

Correct AnswerverifiedShow Answer

A ______________ is an array of electromagnetic radiation and a ___________ is an instrument that spreads light according to color.

Correct AnswerverifiedShow Answer

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Sources of light pollution are...
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Because the atmosphere is opaq...
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Because the magnifying power of a telesc...
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Chromatic aberration occurs in a telescope when __.

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A ____ is an array of electromagnetic radiation and a _ is an instrument that spreads light according to color.

Correct Answer
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