Exam 4: Atomic Physics and Spectra

Stars A and B have the same radius, but the spectrum of star A peaks at a wavelength of 500 nm, whereas star B's spectrum peaks at 1000 nm. What is the ratio of the luminosity of star A to the luminosity of star B?

As a new star evolves from COOL dust and gas to a HOT star, the peak wavelength of its spectrum of emitted electromagnetic radiation could

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

When a blackbody is heated to a temperature T, its total energy flux per second per unit area F at all wavelengths (where $\sigma$ is a constant) is given by

Emission spectra from interstellar gas clouds glow with a variety of colors. Red usually indicates hydrogen, and green is usually a characteristic of

If one neutron is added to a nucleus of an isotope of carbon, ¹²C, in a particular nuclear reaction, the result will be

The temperature of the surface of the Sun is 5800 K. What would be the surface temperature of a star that emits twice the energy flux (watts per square meter) that the Sun emits?

Hydrogen gas is heated to the point at which there are electrons at atomic energy levels up to the n = 3 level. When electrons return to the ground state, what possible emission lines from which spectral sequences will result? See Figure 4-11.

A source emitting waves of constant wavelength approaches an observer, then passes the observer, and recedes into the distance-all at a constant speed. The wavelength of the waves the observer measures from this source

The basic makeup of an atom is

Considering the oxygen isotopes ¹⁵O and ¹⁶O, which of these properties is/are very nearly the same for both isotopes?

Which one of these processes results in an ionized atom?

Light that originates in hydrogen atoms in which electrons have jumped from high levels to the level n = 2 will be part of which series of spectral lines?

What is a neutron?

The overall charge of a singly ionized neon atom Ne, whose position in the periodic table (or atomic number) is 10, in units of electron charge, is

Two stars, A and B, have the same temperature, but star A is 4 times larger in diameter than star B. Which of these statements about these stars is true?

The sequence of ultraviolet emission lines emitted by hot hydrogen gas is known as the _____ series.

The isotope ²⁰Ne has an atomic number of 10. The nucleus of this isotope contains _____ protons and _____ neutrons.

The lines Fraunhofer saw in his solar spectrum were

The physical force that holds the components of an atom together is the