Read Chapter 5
1.) Is it possible for a helium atom to have only 1 proton in its nucleus?
2.) In order for an atom to have no net charge, it must have:
a.) the same number of protons as neutrons
b.) the same number of protons as electrons
c.) the same number of neutrons as electrons
3.) If you wanted to ionize a hydrogen atom, would you have to give the atom energy, or take energy away from it?
4.) For each statement below, write whether it is true or false:
a.) The water molecules in gas phase H2O have more kinetic energy
than the water molecules in solid phase H2O
b.) Most of the atoms in liquids are ionized
c.) The atoms in a plasma are neutral
d.) The temperature at which H2O
molecules dissociate is usually hotter than
the temperature of solid H2O
5.) Problem from the book:
See the energy level diagram for problem 42, in chapter 5 of the 4th
edition of the textbook (also at
http://hal.physast.uga.edu/~rls/1020/ch4/fig4-prob19.jpg)
a.) Which transition represents an electron that gains 10.2 eV of electrical
potential energy?
b.) Which transition represents an electron that loses 10.2 eV of electrical
potential energy?
c.) Which transition represents an electron that is breaking free of the
atom?
d. Which transition is not possible?
e.) If an electron moved from level 3 to level 2, how much electrical
potential energy would the electron gain or lose (and, which is it:
gain energy or lose energy)?
6.) The orange floor in the lecture hall could look orange to us because it
a.) emits orange light and no other visible colors of light
b.) absorbs orange light and no other visible colors of light
c.) reflects orange light and no other visible colors of light
d.) transmits orange light and no other visible colors of light
7.) Compare visible light with radio waves:
a.) Which has the longer wavelength?
b.) Which has the larger frequency?
c.) Which has the larger energy (per "photon")?
8.) Problem from textbook:
In 15 to 45 words (each),
summarize the circumstances under which objects produce:
a.) thermal spectra
b.) emission line spectra
c.) absorption line spectra
9.) Problem from textbook:
Suppose that the temperature of the Sun's surface were 12,000 K rather
than its current temperature (6,000 K).
a.) How much more thermal radiation would the Sun emit (i.e. what is
the ratio between the "new" quantity of emission
and the current quantity of emission)?
b.) How would the color of the emission compare with the current color?
10.) How fast does a spaceship with violet headlights
(the wavelength of this light is 400 nanometers)
have to travel in order for its light to look
orangy-red (the wavelength of this light is 600 nanometers)
to you?
a.) 1/6 c
b.) 1/4 c
c.) 1/2 c
d.) 2/3 c
e.) 3/2 c
11.) Regarding the previous problem, which direction relative
to you would the
spacecraft have to be traveling in order for you to see this effect?
a.) Toward you
b.) Away from you
c.) Perpendicular to the line between you and it
d.) Any direction
