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Exam 6: Astronomical Instruments

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Question 1

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

A) the number of times the image is magnified (how much bigger it looks)
B) the length of the main telescope tube
C) the focal length
D) the length of the eyepiece tube
E) the diameter of the primary lens or mirror

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Question 2

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

A) it is viewed by a group of graduate students who then make a sketch of it to have a permanent record
B) it is recorded on a piece of black & white film, which is then developed in a bath of chemicals
C) it is reflected by a special arrangement of mirrors back into the beam and up into the sky
D) it is recorded using an electronic detector called a CCD for later analysis
E) it is sent to the FBI so they can check for evidence of Russian hacking

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D

Question 3

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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?

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?

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

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

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

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:

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?

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 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?

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

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 radio telescope was built in the 1930's by

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

The most important function of an astronomical telescope is to:

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

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?