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Exam 6: Astronomical Instruments

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Question 1

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An astronomer who is observing visible light from a glowing cloud of gas in space uses an instrument which contains a grating with thousands of grooves on its surface. What will this instrument allow our astronomer to do?

A) take photos with much higher resolution
B) spread out the light from the cloud into a spectrum
C) observe radio waves from the cloud at the same time as visible light
D) turn a reflector into a refractor
E) listen to rock and roll music from the 1960's
Section 6.4: Radio Telescopes

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Question 2

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The most important function of an astronomical telescope is to:

A) collect as much light as possible and bring it to a focus
B) magnify (enlarge) celestial objects so we can see them clearly
C) enhance the violet colors of an object, which our eyes have trouble seeing
D) bring distant objects closer by pulling on the light
E) pierce through the clouds so a cloudy night is not wasted

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Question 3

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The earliest telescopes used by astronomers were:

When the twin Keck telescopes were built in the 1990's, what distinguished them from other very large telescopes of the time?

Of the following, which has the highest resolution (ability to make out fine detail) :

At the largest and most modern astronomical observatories on Earth today, which of the following regularly happens to the image formed by the telescope?

When a knowledgeable amateur astronomer tells you that she has a 14-inch telescope, what does the number 14 refer to?

When they build big new (visible -light) telescopes, astronomers want to put them in places where they will get the best views of the sky. Which of the following is not an important part of how astronomers select places for new telescopes?"

The first x-ray telescope capable of forming images of x-ray source was called:

Radio telescopes of modest size can't make out as much detail (have a lower resolution) than visible light telescopes. How do astronomers overcome this limitation?

Which of the following types of telescopes can be used ONLY above the Earth's atmosphere?

The U.S. has plans to build a 30-meter telescope, while the Europeans are thinking about 39-meter telescope. What technological innovation allows astronomers to be thinking about telescopes with that large an aperture?

Which of the following is NOT an advantage that the Hubble Space Telescope has over large telescopes on Earth?

Which of the following is NOT a detector of radiation from space that astronomers have used?

The two regions of the electromagnetic spectrum where the Earth's atmosphere is transparent (radiation can get in) are visible light and:

The first radio telescope was built in the 1930's by

A graduate student is trying to follow the weather on Jupiter for her PhD thesis. To see the big weather patterns in the upper atmosphere of the planet, she needs to have excellent resolution. What type of telescope would be best for her to use?

What type of telescope can be used routinely on the surface of the Earth during the DAY?

To overcome the problems that blur images and don't provide the best resolution from Earth, astronomers have started using flexible mirrors that change shape many times each second. This technique is called:

Which of the following is not an advantage that a reflector telescope has over a refractor telescope?