Phy 101: Practice Final Exam
1.) North Korea has experienced no economic or technological import sanctions; as it recently conducted an
underground nuclear test.
This sentence is divided into two parts, First Part A; Then Part B. Choose which statement below about parts A
and B is CORRECT.
a. Both Part A and Part B are correct, and Part B explains the reason for Part A.
b. Both Part A and Part B are correct, but Part B does not explain the reason for Part A.
c. Part A is correct, but Part B is not.
d. Part A is incorrect, but Part B is correct.
e. Neither Part A, nor Part B are correct.
Electric Efficiencies
Other Efficiencies
Vehicle Efficiencies
Other Transportation Savings
Renewable Sources
Carbon Capture & Storage
2.) Looking at the above chart on a possible plan for U.S. reduction in CO2 emissions, which of the following
statements is INCORRECT?
a. The second largest projected gain is from renewable energy sources.
b. Efficient use of electricity will produce the greatest reduction.
c. The emissions of CO2 are projected to be about 2.7 billion tons per year by 2056.
d. Increased vehicle efficiency would reduce the emission by about 0.5 billion tons in 2056.
e. If this plan is followed, the overall emissions reduction from a steady trajectory would be from 2.7 down to
0.7 billion tons per year.
3.) A water fountain in a pool produces waves with a frequency of 0.2 Hz. If you looked at one point in the
pool for 40 seconds, how many waves would you see go by?
a. 8 waves
c. 2 waves
e. 200 waves
b. 4 waves
d. 800 waves
4.) If you triple the frequency of a certain wave, what happens to its wavelength provided the speed stays the
same?
a) the wavelength triples
b) the wavelength stays the same
c) The wavelength is cut in 1/3
d) the wavelength goes up by a factor of 6
e) The wavelength is lowered by 1/6
5.) Of the radioactive waste disposal plans listed below, the one which will most likely be utilized in the near
future in the U.S. is ___________.
a. nuclear transmutation into stable substances.
b. dumping into major rivers in the U.S.
c. disposal in the polar ice caps.
d. rocketing the waste into space.
e. storage underground in stable rock formations.
6.) Choose the correct statement from those listed below.
a. Transverse waves are created by displacing a slinky in the same direction as the wave travels.
b. When a piece of paper is placed on one ring of a slinky and you make a series of longitudinal waves
with the slinky, the paper moves a distance A from its equilibrium position then moves back to its equilibrium
position and stops.
c. A full wavelength is found by measuring the distance from a crest to the next trough.
d. The amplitude of a wave describes the height of the wave above its equilibrium position.
e. Constructive interference occurs when two waves that are out of phase with one another superpose
| highest energy state
>
B.
>
| upper lasing level
A.
C.
|lower lasing level
>
D.
| lowest energy state
>
7.) Choose the most accurate statement or choose e if none of the statements is correct.
a. The Arrow, A, represents the levels that lase.
b. Arrow B shows the electron dropping from the highest energy state to the upper lasing level in a stimulated
emission process.
c. The Arrow C designates the lasing created by stimulated emission between the upper and lower lasing levels.
d. Once the atoms drop to the lowest lasing level, Arrow D designate the laser pump that excites the atoms into
the highest energy level.
e. None of the above statements are correct.
8.) Label the following nuclear reaction as to which type of decay it represents and fill in the missing
information.
y?
186
4
74 W  72 Hf + z? He
______x?_______ decay
a. x=alpha, y=182, z=2
b. x=beta, y=182, z=2
c. x=beta, y=184, z=1
d.x=gamma, y=186, z=0
e. x=alpha, y=184, x=-1
9.)
233
91 Pa
has _________ protons, ___________ neutrons, and ____________ nucleons.
a. 142, 233, 91
b. 91, 91, 142
c. 233, 91, 233
d. 91, 233, 142
e. 91, 142, 233
Screen B
Screen C
Screen A
Source
Screen D
Target
Screen G
Screen E
Screen F
10.) In the above experiment, which of the following statements is TRUE.
a. J.J. Thompson proposed a model for the atom which became known as the Raisin Pudding Model, in
which the electrons were a jelly-like smeared-out blob interspersed with positively charged "raisins".
b. When Marsden joined the research group, Rutherford had him and Geiger place the screen at
positions A,B, F, & G, and to their surprise the experimental evidence did not support the Raison Pudding
model because a number of particles were reflected onto those targets.
c. The source in this experiment produced electromagnetic waves which were used by aiming them to
strike and probe the nuclear structure of the target.
d. The new "planetary" model proposed by Rutherford consists of a positively charged nucleus
surrounded by orbiting electrons in which the relative sizes could be described as follows: if the nucleus was a
ping pong ball the electron's orbits would be the size of a tennis ball.
e. Marsden, Rutherford's graduate student, proposed an interpretation of the experimental results in
which he described the many reflected alpha particles as small pieces of lead shot being bounced off a brick
wall, i.e. the atom consisted mostly of a hard sphere of electrons.
11.) If helium-8 has a half-life of 0.119 s, how long would it take for 24 grams of it to decay into 3 grams?
a. 0.178 seconds
b. 0.357 seconds
c. 0.714 seconds
d. 1.309 seconds
e. 1.428 seconds
12.) We say that a scanning tunneling microscope (STM) is used to look at atoms. In fact, an STM actually
looks at ____________ due to the fact that _______________ .
a. positions of the atom’s nucleus, gamma rays flow into the STM tip
b. positions of the atom’s nucleus, neutrons turn into protons and emit electrons which jump to the STM tip.
c. positions of the electron cloud surrounding the nucleus, electrons from the surface jump to the STM tip when
it is close enough
d. positions of the electron cloud surrounding the nucleus, the STM tip drags along the surface sensing the
nucleus
e. positions of the outer electrons, these electrons are tightly bound to the nucleus
13.) The two waves below, A and B, are each moving at a rate of 1 division per second. Of the possible final
resulting waveforms at time t = 3 seconds, which one is CORRECT or choose e if none of the resulting
waveforms is correct?
B
A
T ime
t=0
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
a. T ime
t = 3 sec.
b. Time
t = 3 sec.
c. T ime
t = 3 sec.
d. Time
t = 3 sec.
e. None of the above waveforms is correct.