Exam 3: Light and Telescopes

The sodium D lines are a closely spaced pair of spectral lines in neutral sodium.They are present as absorption lines in the spectrum of the Sun's photosphere because of traces of sodium there.What would you expect to see if sunlight is passed through a cool sodium vapor in the laboratory and then observed with a spectroscope?

Two different isotopes of the element selenium will have the same number of:

If one observatory site is described as having better "seeing" than another observatory site,what is it that is BETTER at the first site?

A high mountaintop such as Mauna Kea in Hawaii is a good site for an infrared observatory primarily because it is:

What is the MAIN reason for placing astronomical telescopes and detectors on satellites?

Which of the following techniques is the key factor in a telescope that uses adaptive optics to correct for atmospheric distortion of images,or "seeing"?

The idea that light consists of photons,bundles of pure energy,was first proposed by:

In the photoelectric effect,a beam of light impinges on a metal,and it is observed that electrons are ejected from the metal in greater numbers as the:

The peak wavelength emitted in the spectrum of a blackbody is proportional to what power of the blackbody's Kelvin temperature?

In a telescope,to what does the term aberration refer?

Which was the first satellite to be dedicated to infrared astronomy?

What is the angular resolution of the Hubble Space Telescope?

The radial velocity of a star or other object is measured by:

An electron is in the n = 3 energy level in a hydrogen atom.What can you say about the spectral series in which it can participate?

Why did Karl Jansky believe the source of radio static he was detecting in 1932 was NOT from terrestrial sources?

The property of a neutral atom that defines its chemical behavior and fixes its position in the periodic table is:

A hydrogen atom in a low-density,hot gas gives off what type of spectrum?

The minimum temperature reached on the surface of Mars,-140°C,is represented on the absolute (Kelvin)temperature scale as:

A particular telescope is set up to use the coudé focus.Which arrangement of mirrors is used to bring the light to this focus?

The secondary mirror of a telescope whose primary mirror is 4 m in diameter has a diameter of 0.5 m.What percentage of the incoming light is obstructed by this secondary mirror?