Exam 3: Light and Telescopes

What is a neutron?

The mass of the electrically neutral particle,the neutron,which is one component of the atomic nucleus along with the proton,is _____ the mass of the proton.

What was the first extraterrestrial radio source to be detected?

The distribution of radiation emitted by a blackbody (i.e.,its spectrum)depends on which one of the following properties of the blackbody?

A beam of light of which of the following pure colors is made up of photons of the highest energy?

Consider a beam of electromagnetic radiation of a single frequency.The energy of each photon in this beam depends on each of the following properties of the beam EXCPET ONE.Which is the exception?

Which of the following wave effects is NOT electromagnetic in nature?

In 1670,Isaac Newton performed a crucial experiment on the nature of light when he:

Hydrogen gas is heated to the point at which there are electrons at atomic energy levels up the n = 3 level.When electrons return to the ground state,what possible emission lines from which spectral sequences will result? (See Figure 3-51,Comins,Discovering the Essential Universe,6th ed.)

Suppose we try to explain Rømer's measurements in the Ptolemaic model (adding the Galilean moons)with circular orbits and Earth in the center of the system.How could the differences in eclipse times be explained?

A spherical mirror suffers from spherical aberration because:

An astronomer,examining two photographs of a small area of sky taken 20 years apart,notices that some of the stars have moved slightly across the sky,relative to most of the other stars in the photographs.This displacement of the stars across the sky is an example of:

When astronomers look for evidence of hydrogen gas in the spectra of the Sun,the planets,or the nearby stars,the positions of the spectral features or "lines" due to hydrogen are in:

A radio telescope:

The solar lines observed by Fraunhofer in the early 1800s were:

How can you increase the magnification of a refracting telescope without decreasing the light-gathering power?

Adaptive optics involves:

Star A has twice the Kelvin temperature at its surface as does star B.The amount of energy radiated per unit area from the surface of A is:

The angle between two adjacent stars whose images can just barely be distinguished by the telescope is a measure of the telescope's:

Which of the following statements is TRUE if the star Betelgeuse has a lower surface temperature than the Sun? (Assume that IR means infrared radiation and UV means ultraviolet radiation.)