Exam 4: A Universe of Universal Laws

Which of the following properties of an astronomical image will improve if the image is made in blue light instead of red light,if all other factors are held constant?

Which of the following types of light has the highest atmospheric transmission?

A telescope with a Cassegrain focus reflects light through an opening in the primary mirror for measurement at a camera.The telescope's mirror therefore has a small hole in it where light cannot be collected.How much smaller is the light-collecting power of a telescope with a primary mirror of diameter 10 m and a circular hole with a diameter of 1 m than an identical telescope without such a hole?

A gas cloud has an emission spectrum.If all of its lines appear at higher photon energies than expected from a comparison to laboratory measurements,the cloud is:

The practice of combining signals from two or more reflectors to achieve better angular resolution is:

A particular water wave has an amplitude of 2 m and a wavelength of 3 m.With this wave,the time between successive crests hit shore is 2 seconds.What is the speed of the wave?

What are the constituents of an atom,and how are they arranged according to the Bohr model?

The speed of a light wave:

A low-density tube of neon gas at room temperature is placed in front of a hot metal rod.An observer will find:

Which of the following is NOT true of the Bohr model of the atom?

Describe the path of light in a reflecting telescope with a Newtonian focus.

Which of the following objects would emit the most radiation?

An atom will emit a photon when an electron:

Among the following,the best angular resolution will be achieved with a ________ diameter telescope observing in ________ light.

What kind of telescope is shown in the figure below? Here the arrows show the path of light rays through the telescope and "F" labels the focus point.

An astronomer observes two stars,A and B.Star A has a temperature of 3,000 K,a radius 10 times that of our Sun,and is 10 parsecs away.Star B has a temperature of 6,000 K,a radius equal to that of our Sun,and is 40 parsecs away.Which star is brighter,and by how much?

A pair of radio dishes,each with collecting area 100 m²,lie a distance of 10 km from each other.With them,astronomers can make a measurement with an effective collecting area of ________ and an effective angular resolution of a telescope with a ________ diameter.

Which of the following varieties of light has the SHORTEST wavelength?

A standard candle allows astronomers to measure:

Which of the following causes blackbody radiation?