Exam 3: Light and Telescopes

Figure 3-42 in Comins,Discovering the Essential Universe,6th ed.,shows that a blackbody with a temperature of 3000 K emits radiation that peaks at a wavelength much longer than wavelengths in the visible part of the spectrum.This means that the object:

Using telescopic observations and spectroscopy,we can determine each of the following aspects of a star EXCEPT ONE.Which is the exception?

The range of temperatures in the Kelvin (absolute)scale between the freezing point and boiling point of water is:

If light from a hot,dense star passes through a cool cloud of gas (see Figure 3-49,Comins,Discovering the Essential Universe,6th ed.):

For many years,the Palomar telescope (5-m diameter)in California was the largest telescope in the world; it has now been surpassed by both Keck telescopes (each of diameter 10 m)in Hawaii.How much greater is the light-gathering power of a Keck telescope than that of the Palomar telescope?

An atom consists of:

What is the magnification of a Newtonian telescope that has a primary mirror of diameter 0.25 m and focal length of 2 m when used with an eyepiece of focal length 25 mm and an optical diameter of 5 mm?

A particular spectrograph,used by an astronomer to disperse light into its colors,contains a piece of glass that has been ruled with thousands of closely spaced,parallel lines.What is this piece of glass called?

In the 1860s,James Clerk Maxwell carried out important investigations on the nature of light when he:

The star P Cygni (in the constellation Cygnus,the Swan)is surrounded by an extensive low-density atmosphere.It has a bright,continuous spectrum with many narrow,dark absorption lines and a few bright emission lines.The bright,continuous part of the spectrum is produced by:

The sharpest images of stars that can be formed by a single,large,ground-based,visible-light telescope are of the order of what angular size?

What type of spectrum is given off by low-density,high-temperature hydrogen gas?

When the Galileo spacecraft reached Jupiter on December 7,1995,Jupiter was almost at conjunction with the Sun.Given that it takes 8 1/3 minutes for light to travel a distance of 1 AU,how long did it take Galileo's signals to reach Earth from Jupiter? (A diagram might help you to envision this configuration.)

Earth's atmosphere is transparent to which of the following types of electromagnetic radiation?

Which of the following sequences of electromagnetic radiation is CORRECT,in order of increasing energy of the photons (or quanta)?

When light from the concave primary mirror of a telescope is reflected by a small secondary mirror through a hole in the primary to its focus,it is called the:

When light passes from air into a dense but transparent material such as glass,it:

The major cause of blurred and unsharp images of objects observed through very large telescopes at the extreme limit of magnification is the:

Spectral lines are of particular importance in astronomy because:

A change of one unit on which of the following temperature scales will result in the SMALLEST temperature change?