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Exam 6: Light and Telescopes

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Question 1

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Adaptive optics are used to produce what effect?

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

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Question 2

Multiple Choice

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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?

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

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Question 3

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

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

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

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

A particle of light is a

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

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?

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

Which of the following kinds of photons are least energetic?

Radio astronomers obtain great angular resolution by

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 are NOT electromagnetic waves?

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

The Doppler Effect is _____________________.

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

Compared with infrared waves,radio waves

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