Question 1

Which of the following forms of electromagnetic waves (or photons)has the greatest energy?

Accepted Answer

A) Visible 
B) X-ray 
C) Infrared 
D) Ultraviolet 
A) Visible 
B) X-ray 
C) Infrared 
D) Ultraviolet B

Question 2

A particle of light is a

Accepted Answer

A) Graviton 
B) Proton 
C) Spectrum 
D) Photon 
E) Angstrom 
A) Graviton 
B) Proton 
C) Spectrum 
D) Photon 
E) Angstrom D

Question 3

Which of the following forms of electromagnetic radiation has the longest wavelength?

Accepted Answer

A) Visible 
B) X-ray 
C) Infrared 
D) Ultraviolet 
A) Visible 
B) X-ray 
C) Infrared 
D) Ultraviolet C

Question 4

How does the speed of light in glass compare to the speed of light in a vacuum?

Accepted Answer

A) It is larger in glass 
B) It is larger in a vacuum 
C) Trick question,light can't travel in glass 
D) They are the same 
A) It is larger in glass 
B) It is larger in a vacuum 
C) Trick question,light can't travel in glass 
D) They are the same

Question 5

Which of the following are NOT electromagnetic waves?

Accepted Answer

A) Radio waves 
B) Optical light 
C) X-rays 
D) Gravitational waves 
A) Radio waves 
B) Optical light 
C) X-rays 
D) Gravitational waves

Question 6

When used at a wavelength of 1 micron,a telescope can resolve angles as small as 0.1 seconds of arc.How small an angle could the telescope resolve when used at a wavelength of 5 microns?

Accepted Answer

A) 0.02 seconds of arc 
B) 0.004 seconds of arc 
C) 0.5 seconds of arc 
D) 0.25 seconds of arc 
A) 0.02 seconds of arc 
B) 0.004 seconds of arc 
C) 0.5 seconds of arc 
D) 0.25 seconds of arc

Question 7

Telescope A has a mirror that is 10 times larger than the mirror of telescope B.Telescope A can resolve an angle as small as 0.1 seconds of arc.
What is the smallest angle that can be resolved by telescope B?

Accepted Answer

A) 10 seconds of arc 
B) 1 second of arc 
C) 0.1 second of arc 
D) 0.01 second of arc 
A) 10 seconds of arc 
B) 1 second of arc 
C) 0.1 second of arc 
D) 0.01 second of arc

Question 8

A telescope that uses a lens to bring radiation to a focus is called a

Accepted Answer

A) Radio telescope 
B) Reflector 
C) Refractor 
D) Photometer 
A) Radio telescope 
B) Reflector 
C) Refractor 
D) Photometer

Question 9

How does the light-gathering power of a 40 cm telescope compare to that of a 20 cm telescope?

Accepted Answer

A) They are the same 
B) 2 times as great 
C) 4 times as great 
D) 8 times as great 
A) They are the same 
B) 2 times as great 
C) 4 times as great 
D) 8 times as great

Question 10

Suppose you want to determine if there is any methane gas on a newly discovered planet.You need to equip your telescope with a

Accepted Answer

A) CCD 
B) Photographic plate holder 
C) Spectrometer 
D) Space probe,since you can't determine anything about gases without travelling there. 
A) CCD 
B) Photographic plate holder 
C) Spectrometer 
D) Space probe,since you can't determine anything about gases without travelling there.

Question 11

How many 4 meter telescopes would be required to match the light-gathering power of a 15 meter telescope?

Accepted Answer

A) 2 
B) 6 
C) 14 
D) 20 
A) 2 
B) 6 
C) 14 
D) 20

Question 12

A star is moving away from an observer at 1% of the speed of light.At what wavelength would the observer find an emission line that would occur at a wavelength of 6000 Angstroms if the star were at rest?

Accepted Answer

A) 6060 Angstroms 
B) 6010 Angstroms 
C) 6000 Angstroms 
D) 5940 Angstroms 
A) 6060 Angstroms 
B) 6010 Angstroms 
C) 6000 Angstroms 
D) 5940 Angstroms

Question 13

Adaptive optics are used to produce what effect?

Accepted Answer

A) Optical compensation for atmospheric turbulence 
B) Automatic changing of the magnification 
C) Produce increases in the appeture diameter 
D) Combine telescopic arrays to increase resolution of the image 
A) Optical compensation for atmospheric turbulence 
B) Automatic changing of the magnification 
C) Produce increases in the appeture diameter 
D) Combine telescopic arrays to increase resolution of the image

Question 14

A TV satellite broadcasts at a frequency of 5000 MHz,(1 MHz = 1 million Hertz).What is the wavelength of this radiation?

Accepted Answer

A) 1000 cm 
B) 5 million centimeters 
C) 6 cm 
D) 0.3 cm 
A) 1000 cm 
B) 5 million centimeters 
C) 6 cm 
D) 0.3 cm

Question 15

Radio astronomers obtain great angular resolution by

Accepted Answer

A) Observing at the longest wavelength possible 
B) Using arrays of radio telescopes 
C) Observing objects when they are near the horizon 
D) Observing an object with the same telescope for many years 
A) Observing at the longest wavelength possible 
B) Using arrays of radio telescopes 
C) Observing objects when they are near the horizon 
D) Observing an object with the same telescope for many years

Question 16

Which of the following kinds of photons are least energetic?

Accepted Answer

A) Infrared 
B) Visible 
C) Ultraviolet 
D) X-ray 
A) Infrared 
B) Visible 
C) Ultraviolet 
D) X-ray

Question 17

Compared with infrared waves,radio waves

Accepted Answer

A) Have higher energy 
B) Have lower frequency 
C) Take much longer to reach us from celestial objects 
D) Have shorter wavelengths 
A) Have higher energy 
B) Have lower frequency 
C) Take much longer to reach us from celestial objects 
D) Have shorter wavelengths

Question 18

The Doppler Effect is _____________________.

Accepted Answer

A) the speed of light divided by the frequency of the wave 
B) the change in the wavelength divided by the change in the frequency 
C) the change in frequency and wavelength of a wave due to motion between the source and observer 
D) the decrease in wave intensity with increasing distance from the source 
A) the speed of light divided by the frequency of the wave 
B) the change in the wavelength divided by the change in the frequency 
C) the change in frequency and wavelength of a wave due to motion between the source and observer 
D) the decrease in wave intensity with increasing distance from the source

Question 19

In the laboratory,a spectral line of an element has a wavelength of 5000 Angstroms.What would be the measured wavelength of that line in the spectrum of a planet that is approaching at a velocity of 30 km/s? (The speed of light is 300,000 km/s. )

Accepted Answer

A) 4999.5 Angstroms 
B) 4995 Angstroms 
C) 5000.5 Angstroms 
D) 5005 Angstroms 
A) 4999.5 Angstroms 
B) 4995 Angstroms 
C) 5000.5 Angstroms 
D) 5005 Angstroms

Question 20

Which of the following is true about the frequency and wavelength of electromagnetic waves?

Accepted Answer

A) The product of frequency and wavelength is the same for all such waves 
B) As frequency increases,wavelength increases 
C) Frequency is constant for all wavelengths 
D) Frequency and wavelength are independent of each other 
A) The product of frequency and wavelength is the same for all such waves 
B) As frequency increases,wavelength increases 
C) Frequency is constant for all wavelengths 
D) Frequency and wavelength are independent of each other

Exam 6: Light and Telescopes

Which of the following forms of electromagnetic waves (or photons)has the greatest energy?

A particle of light is a

Which of the following forms of electromagnetic radiation has the longest wavelength?

How does the speed of light in glass compare to the speed of light in a vacuum?

Which of the following are NOT electromagnetic waves?

When used at a wavelength of 1 micron,a telescope can resolve angles as small as 0.1 seconds of arc.How small an angle could the telescope resolve when used at a wavelength of 5 microns?

Telescope A has a mirror that is 10 times larger than the mirror of telescope B.Telescope A can resolve an angle as small as 0.1 seconds of arc. What is the smallest angle that can be resolved by telescope B?

A telescope that uses a lens to bring radiation to a focus is called a

How does the light-gathering power of a 40 cm telescope compare to that of a 20 cm telescope?

Suppose you want to determine if there is any methane gas on a newly discovered planet.You need to equip your telescope with a

How many 4 meter telescopes would be required to match the light-gathering power of a 15 meter telescope?

A star is moving away from an observer at 1% of the speed of light.At what wavelength would the observer find an emission line that would occur at a wavelength of 6000 Angstroms if the star were at rest?

Adaptive optics are used to produce what effect?

A TV satellite broadcasts at a frequency of 5000 MHz,(1 MHz = 1 million Hertz).What is the wavelength of this radiation?

Radio astronomers obtain great angular resolution by

Which of the following kinds of photons are least energetic?

Compared with infrared waves,radio waves

The Doppler Effect is _____________________.

In the laboratory,a spectral line of an element has a wavelength of 5000 Angstroms.What would be the measured wavelength of that line in the spectrum of a planet that is approaching at a velocity of 30 km/s? (The speed of light is 300,000 km/s. )

Which of the following is true about the frequency and wavelength of electromagnetic waves?

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