Exam 5: Light and Telescopes

Far-ultraviolet rays have short wavelengths, low energies, and travel at the speed of sound.

The main lens or mirror of a telescope is called the ____________________.

The light-gathering power of a telescope increases as the size of the objective increases.

Far infrared astronomy must be done from high-flying aircraft because

Which wavelength band uses observatories on aircraft?

Radio telescopes which use dishes to gather radio waves are _______ telescopes.

Infrared space telescopes must have their mirror cooled to very low temperatures because otherwise it would thermally emit too much _______ itself.

What is the magnification of a telescope and eyepiece if the telescope objective has a focal length of 200 cm and the eyepiece has a focal length of 2.0 cm?

________________ absorbs most of the ultraviolet radiation coming from the Sun.

An achromatic lens brings all colors to the same focus.

Which of the following types of electromagnetic radiation has the lowest energy?

Which of the following sequences of electromagnetic radiation is correct in order of increasing energy?

A telescope that is 1.0 meter in diameter has a focal length of 10 meters. An eyepiece with a focal length of 0.01 meters that is used with this telescope would have a magnification of ____________________?

Which produces a brighter image? Choose the best answer.

The ____ of a telescope is a measure of its ability to show fine detail and depends on the diameter of the objective.

The sidereal drive on a telescope mounting must turn the telescope eastward about the polar axis.

The largest single-dish radio telescope is

The diagram below illustrates the layout and light path of a reflecting telescope of the ____________________ design.

Interferometry

Cosmic rays are electromagnetic radiation.