Question 1

A red photon has a wavelength of 650 nm.An ultraviolet photon has a wavelength of 250 nm.The energy of an ultraviolet photon is __________ than a red photon.

Accepted Answer

A)   2.6 times larger
B)   6.8 times larger
C)   2.6 times smaller
D)   6.8 times smaller

Question 2

Which of the following photons carry the least amount of energy?

Accepted Answer

A)   A blue photon of the visible spectrum,whose wavelength is 450 nm
B)   An infrared photon,whose wavelength is 10-5 m
C)   A red photon in the visible spectrum,whose wavelength is 700 nm
D)   A microwave photon,whose wavelength is 10-2 m

Question 3

Compare and contrast the wavelengths,frequencies,speeds,and energies of red and blue photons.

Accepted Answer

Red and blue photons both trav...

Question 4

The image below shows the Very Large Array in New Mexico.Radio telescopes are often used in interferometric arrays to increase light gathering power.

Accepted Answer

A) True 
 B)False

Question 5

The energy of a photon is inversely proportional to its wavelength.

Accepted Answer

A) True 
 B)False

Question 6

Before CCDs were invented,what was the device most commonly used for imaging with optical telescopes?

Accepted Answer

A)   Polaroid cameras
B)   Photographic glass plates
C)   High-speed film
D)   Video cameras

Question 7

The SETI project's Allen Telescope Array will have 350 radio dishes,each with an individual diameter of 6 m,spread out over a circle whose diameter is 1 km.What would this array's spatial resolution be when it operates at 6,000 MHz?

Accepted Answer

A)   10 arcsec
B)   0.10 arcsec
C)   10 arcmin
D)   1.0 arcmin

Question 8

The speed of light in a vacuum is __________.

Accepted Answer

A)   300,000 m/s
B)   300,000 mph
C)   300,000 km/s
D)   300,000,000 mph
E)   infinite

Question 9

When we determine the angular resolution of an interferometric array of radio telescopes using the formula  Θ∝λ\varTheta\varpropto\lambdaΘ∝λ /D,the variable D stands for the:

Accepted Answer

A)   diameter of the telescopes
B)   separation between the telescopes
C)   number of telescopes
D)   focal length of the telescopes

Question 10

Ultraviolet radiation is hard to observe primarily because:

Accepted Answer

A)   the Earth's atmosphere easily absorbs it
B)   no space-based telescopes operate at ultraviolet wavelengths
C)   only the lowest mass stars emit ultraviolet light
D)   very few objects emit at ultraviolet wavelengths

Question 11

Astronomers usually study distant objects by looking at them directly through the eyepiece of a telescope.

Accepted Answer

A) True 
 B)False

Question 12

Explain how adaptive optics help compensate for atmospheric seeing.

Accepted Answer

Slight perturbances in the atmosphere ca...

Question 13

What is the angular resolution of a 1-m,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-m,ground...

Question 14

Which of the following causes the biggest problem in detecting infrared photons from an astronomical object?

Accepted Answer

A)   Smog
B)   Carbon dioxide
C)   Water vapor
D)   Light pollution

Question 15

The 305-m Arecibo radio telescope has a resolution that is no better than that of the human eye.

Accepted Answer

A) True 
 B)False

Question 16

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

Accepted Answer

A)   they operate above the 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 the Earth's atmosphere
D)   composite lenses correct for chromatic aberration

Question 17

Using the figure below,which type of electromagnetic wave has a wavelength of approximately 10−5 m?
−5 m?   A)  X-rays B)  Infrared C)  Microwave D)  Radio" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   X-rays
B)   Infrared
C)   Microwave
D)   Radio

Question 18

Why is an iron atom a different element than a sodium atom?

Accepted Answer

A)   A sodium atom has fewer neutrons in its nucleus than an iron atom.
B)   An iron atom has more protons in its nucleus than a sodium atom.
C)   A sodium atom is bigger than an iron atom.
D)   All of the above are true.

Question 19

Which telescope would collect 100 times more light than a 1-m telescope?

Accepted Answer

A)   100-m telescope
B)   50-m telescope
C)   30-m telescope
D)   10-m telescope

Question 20

How do the wavelength and frequency of red light compare to the wavelength and frequency of blue light?

Accepted Answer

A)   Red light has a longer wavelength and higher frequency than those of blue light.
B)   Red light has a longer wavelength and lower frequency than those of blue light.
C)   Red light has a shorter wavelength and higher frequency than those of blue light.
D)   Red light has a shorter wavelength and lower frequency than those of blue light.

Exam 4: Light and Telescopes

The image below shows the Very Large Array in New Mexico.Radio telescopes are often used in interferometric arrays to increase light gathering power.

Correct AnswerverifiedShow Answer

How do the wavelength and frequency of red light compare to the wavelength and frequency of blue light?

Correct AnswerverifiedShow Answer

The 305-m Arecibo radio telescope has a resolution that is no better than that of the human eye.

Correct AnswerverifiedShow Answer

Astronomers usually study distant objects by looking at them directly through the eyepiece of a telescope.

Correct AnswerverifiedShow Answer

When we determine the angular resolution of an interferometric array of radio telescopes using the formula Θ∝λ\varTheta\varpropto\lambdaΘ∝λ /D,the variable D stands for the:

Correct AnswerverifiedShow Answer

A red photon has a wavelength of 650 nm.An ultraviolet photon has a wavelength of 250 nm.The energy of an ultraviolet photon is __________ than a red photon.

Correct AnswerverifiedShow Answer

Explain how adaptive optics help compensate for atmospheric seeing.

Correct AnswerverifiedSlight perturbances in the atmosphere ca...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

What is the angular resolution of a 1-m,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?

Correct AnswerverifiedThe angular resolution of the 1-m,ground...View AnswerShow Answer

Why is an iron atom a different element than a sodium atom?

Correct AnswerverifiedShow Answer

The SETI project's Allen Telescope Array will have 350 radio dishes,each with an individual diameter of 6 m,spread out over a circle whose diameter is 1 km.What would this array's spatial resolution be when it operates at 6,000 MHz?

Correct AnswerverifiedShow Answer

The speed of light in a vacuum is __________.

Correct AnswerverifiedShow Answer

Which of the following photons carry the least amount of energy?

Correct AnswerverifiedShow Answer

The energy of a photon is inversely proportional to its wavelength.

Correct AnswerverifiedShow Answer

Ultraviolet radiation is hard to observe primarily because:

Correct AnswerverifiedShow Answer

Compare and contrast the wavelengths,frequencies,speeds,and energies of red and blue photons.

Correct AnswerverifiedRed and blue photons both trav...View AnswerShow Answer

Which of the following causes the biggest problem in detecting infrared photons from an astronomical object?

Correct AnswerverifiedShow Answer

Before CCDs were invented,what was the device most commonly used for imaging with optical telescopes?

Correct AnswerverifiedShow Answer

Which telescope would collect 100 times more light than a 1-m telescope?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

When we determine the angular resolution of an interferometric array of radio telescopes using the formula $\varTheta\varpropto\lambda$ /D,the variable D stands for the:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Slight perturbances in the atmosphere ca...
View Answer

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

Correct Answer
verified

Correct Answer
verified
The angular resolution of the 1-m,ground...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Red and blue photons both trav...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified