Illinois
State University
Department
of Physics Dr. Clark
Atoms
to Galaxies Phy
102 Homework
F =
m a F =
(G m1 m2)/r2 g
= 10m/s2
K.E.
= (1/2)mv2 P.E.
= mgh F = (k
q1 q2)/r2
f =
c/l c = 3 x 108m/s C = (F-32)(5/9)
n =
c/v
Choose the most correct
answer. Only the first 25 questions are for credit.
For
question 1 through 5 choose from the following responses.
a. true b. false
1.
The observed interference pattern produced when light passes through a single
slit can be explained via the particle picture of light.
2.
In general, the greater the index of refraction of the glass is, then the
slower the light travels in the glass.
3.
X-rays have more energy per photon than does ultraviolet light.
4.
Infrared radiation is the primary form of light associated with mutations resulting
in skin cancers.
5.
The shorter the wavelength of light, then the greater the energy per photon.
6.
The element represented by the symbol, U, is uranium. All uranium isotopes must have the same number of
a. protons. b. neutrons.
c. nucleons. d. electrons.
7.
An emission spectrum (bright lines or bands) comes from a material that is
_____ the background light source.
a. the same temperature as b. warmer than
c. colder than d. none
of the above
21
8.
An atom represented by the symbol, 10Ne
has
a. 10 nucleons. b. 11
protons.
c. 11 neutrons. d. 21
protons.
9.
The element represented by the symbol, K, is potassium. All potassium ions must have the same number
of
a. protons. b. neutrons.
c. nucleons. d. electrons.
10.
When an electron decreases its average distance from its nucleus, it produces
a. a spectral absorption line.
b. a spectral emission line.
c. none of the above.
11.
The continuous part of the solar spectrum, taken by itself, is evidence that
the part of the sun that produces the continuous spectrum
a. may be a low density gas.
b. may be a high density
gas.
c. must be a solid.
d. none of the above.
12.
If the sun were white, then its surface would be
a. substantially colder than it is.
b. substantially warmer than it is.
c. about the same temperature, it
would just emit more energy.
13.
From the following choices, pick the correct order of particles from most
positive to least positive.
a. proton, electron, neutron
b. electron, neutron, proton
c. neutron, proton, electron
d. proton, neutron, electron
14.
For two objects of the same size, the colder object
a. emits more radiation at shorter
wavelengths than the warmer object.
b. emits more radiation at longer
wavelengths than the warmer object.
c. both of the above
d. none of the above
15. As an object is heated,
the peak wavelength of its emission moves toward
a. shorter wavelengths.
b. longer wavelengths.
c. None of the above, because the peak does not move.
16.
The temperature scale that is most closely related to the total energy of a
system is the _______ scale.
a. Fahrenheit b. Celsius
c. Planck d. Kelvin
17.
The order of colors of photons going from the highest energy to lowest energy
are
a. green, red, and yellow.
b. green, yellow, and red.
c. red, green, and yellow.
d. red, yellow, and green.
18. The lower the frequency of light, then the
______ the wavelength.
a. longer
b. shorter
c. none of the above, because
wavelength is not related to frequency
d. none of the above, because the
wavelength of all light is the same
19.
Light with a wavelength of 3000 A (3 x 10-7 m) has a frequency of
a. 10 Hz. b. 1 x 105
Hz.
c. 1 x 1011 Hz. d. 1 x 1015
Hz.
20.
When the distance between two charged particles is decreased by a factor of 2,
the electric force between them
a. increases by a factor of 2.
b. increases by a factor of 4.
c. decreases by a factor of 4.
d. decreases by a factor of 2.
21.
The energy of photon A is twice the energy of photon B. Photon A has _____ photon B.
a. one half the frequency of b. double the frequency of
c. four times the frequency of d. the same frequency as
22.
Heat transfer via the motion of photons is
a. convection. b.
conduction.
c. electron emission. d. radiation.
23.
Newton’s laws describe the physics of objects that are ______.
a. large b. very small
c. slow d.
very fast
e. both a and c f. both b
and d
24.
Object A is smaller and much hotter than object B. Object A must have
a. more total energy than object B.
b. more energy per atom than object B.
c. more energy per atom but less total energy than object
B.
d. more total energy but less energy per atom than
object B.
25. The electric force and
gravitational force are both proportional to
a. mass. b.
charge.
c. 1/(distance)2.