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Exam 6: Light and Telescopes

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Question 1

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The Very Large Array radio telescope in New Mexico is an example of the use of which astronomical technique?

A) spectral analysis
B) photometry
C) interferometry
D) resolving power
E) cosmic analysis

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Question 2

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What is a major selecting factor for astronomers looking to place a telescope atop a mountain?

A) non-turbulent airflow
B) percentage of tree-coverage
C) amount of precipitation
D) the country it is located within
E) the economics of the location

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Question 3

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Which type of electromagnetic wave is the shortest?

Reflecting telescopes suffer from chromatic aberration because the light must pass through the glass.

Match the name of the telescope to its description.

CCD images captured from telescopes are often ____ to be stored in a computer's memory for later analysis.

Light gathering power and resolving power both depend on what characteristic of a telescope?

What unit is used to measure wavelengths?

A spectrograph spreads out light according to ____ to form a spectrum.

Short-focal-length lenses and mirrors must be strongly curved.

What does a refracting telescope use to gather and focus light?

Space-based telescopes carrying long-wavelength infrared detectors must carry coolant such as liquid helium to chill their optics to near absolute zero temperature.

What type of electromagnetic radiation does Chandra collect?

Refracting and reflecting telescopes form an image that is small, inverted, and difficult to observe directly; therefore, an eyepiece is normally used to magnify the image and make it convenient to view.

Refracting telescopes use a mirror to gather and focus light.

What technique often requires the use of a laser guide star?

Light-gathering power is proportional to the _______________ of the telescope primary lens or mirror.

What is so unique about the mirrors of telescopes such as the Keck Observatory, Gran Telescopio Canaries and the soon-to-be-built Giant Magellan Telescope?

Space t elescopes carrying long-wavelength infrared detectors must carry _______________ for their optics to avoid the insides of the telescope and instruments from blinding the detectors.

All large astronomical telescopes built since the start of the 20th century have been _______________ telescopes.