Question 1

Why do reflecting telescopes usually have a secondary mirror in addition to a primary mirror?

Accepted Answer

A)  to increase the light-gathering power 
B)  to make the telescope shorter 
C)  to increase the focal length 
D)  to combat chromatic aberration 
A)  to increase the light-gathering power 
B)  to make the telescope shorter 
C)  to increase the focal length 
D)  to combat chromatic aberration

Question 2

Why is the wavelength of a reflected light wave generally equal to that of the incident wave?

Accepted Answer

The electrons of the reflecting surface

Question 3

The light-year is a unit of:

Accepted Answer

A)  time. 
B)  distance. 
C)  speed. 
D)  energy. 
A)  time. 
B)  distance. 
C)  speed. 
D)  energy.

Question 4

Which formula denotes how the speed of light is related to its wavelength and frequency?

Accepted Answer

A)  c = lf 
B)  c = l/f 
C)  c = f/l 
D)  c = 1/lf 
A)  c = lf 
B)  c = l/f 
C)  c = f/l 
D)  c = 1/lf

Question 5

Explain how adaptive optics help compensate for atmospheric seeing.

Accepted Answer

Slight perturbances in the atmosphere ca

Question 6

Light with a wavelength of 600 nm has a frequency of:

Accepted Answer

A)  5.0 × 106 Hz. 
B)  5.0 × 1014 Hz. 
C)  5.0 × 1011 Hz. 
D)  2.0 × 1015 Hz. 
A)  5.0 × 106 Hz. 
B)  5.0 × 1014 Hz. 
C)  5.0 × 1011 Hz. 
D)  2.0 × 1015 Hz.

Question 7

Using the figure below,list the different types of electromagnetic waves in order of increasing frequency.

Accepted Answer

Radio,microwave,infr

Question 8

Cameras that use adaptive optics provide higher spatial resolution images primarily because:

Accepted Answer

A)  they operate above Earth's atmosphere. 
B)  they capture infrared light, which has a longer wavelength than visible light. 
C)  deformable mirrors are used to correct the blurring due to Earth's atmosphere. 
D)  composite lenses correct for chromatic aberration. 
A)  they operate above Earth's atmosphere. 
B)  they capture infrared light, which has a longer wavelength than visible light. 
C)  deformable mirrors are used to correct the blurring due to Earth's atmosphere. 
D)  composite lenses correct for chromatic aberration.

Question 9

The speed of a light wave:

Accepted Answer

A)  is altered by a refractive medium. 
B)  is reduced whenever reflection occurs. 
C)  is not altered by reflection or refraction. 
D)  is not altered by refraction. 
A)  is altered by a refractive medium. 
B)  is reduced whenever reflection occurs. 
C)  is not altered by reflection or refraction. 
D)  is not altered by refraction.

Question 10

As wavelength increases,the energy of a photon ________ and its frequency ________.

Accepted Answer

A)  increases; decreases 
B)  increases; increases 
C)  decreases; decreases 
D)  decreases; increases 
A)  increases; decreases 
B)  increases; increases 
C)  decreases; decreases 
D)  decreases; increases

Question 11

Does the wavelength of a wave change when entering a refractive medium? Explain.

Accepted Answer

Yes.The frequency remains cons

Question 12

What are two properties shared between the eye and all other astronomical detectors?

Accepted Answer

A)  integration time and wavelength sensitivity 
B)  quantum efficiency and integration time 
C)  wavelength sensitivity and signal strength 
D)  quantum efficiency and signal strength 
A)  integration time and wavelength sensitivity 
B)  quantum efficiency and integration time 
C)  wavelength sensitivity and signal strength 
D)  quantum efficiency and signal strength

Question 13

Using the figure below,which type of electromagnetic wave has a wavelength of approximately 10-⁵ meter?

Accepted Answer

A)  X-rays 
B)  infrared 
C)  microwave 
D)  radio 
A)  X-rays 
B)  infrared 
C)  microwave 
D)  radio

Question 14

How does the resolution of a telescope depend on its focal length?

Accepted Answer

A)  The longer the focal length is the better the resolution is. 
B)  The longer the focal length is the worse the resolution is. 
C)  There is no relation between resolution and focal length. 
A)  The longer the focal length is the better the resolution is. 
B)  The longer the focal length is the worse the resolution is. 
C)  There is no relation between resolution and focal length.

Question 15

Discuss two tools that modern astronomers use to explore the cosmos that are different from traditional optical telescopes,and give an example of how and why each is used.

Accepted Answer

Here are some possible answers:
(1)Radio

Question 16

The light-gathering power of a 4-meter telescope is ________ than that of a 2-meter telescope.

Accepted Answer

A)  8 times larger 
B)  4 times larger 
C)  16 times smaller 
D)  2 times smaller 
A)  8 times larger 
B)  4 times larger 
C)  16 times smaller 
D)  2 times smaller

Question 17

The part of the human eye that acts as the detector is the:

Accepted Answer

A)  retina. 
B)  pupil. 
C)  rods. 
D)  cones. 
A)  retina. 
B)  pupil. 
C)  rods. 
D)  cones.

Question 18

What is the angular resolution of a 1-meter,ground-based,optical telescope that observes at a wavelength of 600 nm compared to that of a 300-ft,single-dish radio telescope that observes at a wavelength of 21 cm?

Accepted Answer

The angular resolution of the 1-meter,gr

Question 19

How do telescopes advance astronomical science?

Accepted Answer

Telescopes allow observation o

Question 20

Compare the light-gathering power of the human eye to that of a 10-inch telescope.

Accepted Answer

Light-gathering power is proportional to

Why do reflecting telescopes usually have a secondary mirror in addition to a primary mirror?

Why is the wavelength of a reflected light wave generally equal to that of the incident wave?

The light-year is a unit of:

Which formula denotes how the speed of light is related to its wavelength and frequency?

Explain how adaptive optics help compensate for atmospheric seeing.

Light with a wavelength of 600 nm has a frequency of:

Using the figure below,list the different types of electromagnetic waves in order of increasing frequency.

Cameras that use adaptive optics provide higher spatial resolution images primarily because:

The speed of a light wave:

As wavelength increases,the energy of a photon and its frequency .

Does the wavelength of a wave change when entering a refractive medium? Explain.

What are two properties shared between the eye and all other astronomical detectors?

Using the figure below,which type of electromagnetic wave has a wavelength of approximately 10-⁵ meter?

How does the resolution of a telescope depend on its focal length?

Discuss two tools that modern astronomers use to explore the cosmos that are different from traditional optical telescopes,and give an example of how and why each is used.

The light-gathering power of a 4-meter telescope is ________ than that of a 2-meter telescope.

The part of the human eye that acts as the detector is the:

What is the angular resolution of a 1-meter,ground-based,optical telescope that observes at a wavelength of 600 nm compared to that of a 300-ft,single-dish radio telescope that observes at a wavelength of 21 cm?

How do telescopes advance astronomical science?

Compare the light-gathering power of the human eye to that of a 10-inch telescope.

Thinking Like an Astronomer

Patterns in the Skymotions of Earth and the Moon

Laws of Motion

The Formation of Stars and Planets

Terrestrial Worlds in the Inner Solar System

Atmospheres of Venus, earth, and Mars

The Giant Planets

Small Bodies of the Solar System

Measuring the Stars

Our Star: the Sun

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

Measuring Galaxies

Our Galaxy: the Milky Way

The Evolution of the Universe

Formation of Structure

Life in the Universe

Filters

Exam 4: Light and Telescopes

Why do reflecting telescopes usually have a secondary mirror in addition to a primary mirror?

Why is the wavelength of a reflected light wave generally equal to that of the incident wave?

The light-year is a unit of:

Which formula denotes how the speed of light is related to its wavelength and frequency?

Explain how adaptive optics help compensate for atmospheric seeing.

Light with a wavelength of 600 nm has a frequency of:

Using the figure below,list the different types of electromagnetic waves in order of increasing frequency.

Cameras that use adaptive optics provide higher spatial resolution images primarily because:

The speed of a light wave:

As wavelength increases,the energy of a photon ________ and its frequency ________.

Does the wavelength of a wave change when entering a refractive medium? Explain.

What are two properties shared between the eye and all other astronomical detectors?

Using the figure below,which type of electromagnetic wave has a wavelength of approximately 10-⁵ meter?

How does the resolution of a telescope depend on its focal length?

Discuss two tools that modern astronomers use to explore the cosmos that are different from traditional optical telescopes,and give an example of how and why each is used.

The light-gathering power of a 4-meter telescope is ________ than that of a 2-meter telescope.

The part of the human eye that acts as the detector is the:

What is the angular resolution of a 1-meter,ground-based,optical telescope that observes at a wavelength of 600 nm compared to that of a 300-ft,single-dish radio telescope that observes at a wavelength of 21 cm?

How do telescopes advance astronomical science?

Compare the light-gathering power of the human eye to that of a 10-inch telescope.

Thinking Like an Astronomer

Patterns in the Skymotions of Earth and the Moon

Laws of Motion

The Formation of Stars and Planets

Terrestrial Worlds in the Inner Solar System

Atmospheres of Venus, earth, and Mars

The Giant Planets

Small Bodies of the Solar System

Measuring the Stars

Our Star: the Sun

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

Measuring Galaxies

Our Galaxy: the Milky Way

The Evolution of the Universe

Formation of Structure

Life in the Universe

Filters

As wavelength increases,the energy of a photon and its frequency .