PHYS 234 Fall 2021 Final Exam
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Purdue University *
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Course
234
Subject
Chemistry
Date
Dec 6, 2023
Type
Pages
9
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Final Exam Page
1
NAME:
Signature:
PURDUE ID Number:
PHYS 234
Fall 2021 Final Exam
Friday 17
th
December 2021
1.
There are a total of 9 pages on this exam. Please write your name on each one.
a.
Page 2 contains potentially useful equations and constant.
b.
Pages 3-8 contain 32 multiple choice and true/false questions, each worth one point.
Please mark your answers for these questions clearly on the bubble sheet provided.
c.
Page 9 contains an estimation problem worth 8 points. Please write your entire
answer on the page provided. You may use the back of the page if you need more
room.
2.
When you are asked to write an explanation, you will be graded on depth, coherence, and
clarity. Correct answers with incomplete explanations will not get full credit.
3.
Raise your hand if you have a question.
4.
This is a closed book test. You may not use any notes or equation sheets. You may use a
calculator provided it is not capable of accessing the internet.
NAME:______________________________________________________________________
Final Exam Page
2
Equations and constants:
Metric system: 1 cm = 10
-2
m, 1 mm = 10
-3
m, 1 μm = 10
-6
m, 1 nm = 10
-9
m, 1 pm = 10
-12
m.
Power:
࠵? =
!
∆#
=
$
#
: (units: 1 Watt = 1Joule/second = 1 Ampere
°
Volt)
Gravity:
F
=
mg
,
U
=
mgh
,
g
= 10 m/s
2
Universal gravitation:
࠵? =
%&’
(
!
,
࠵? = 6.67 × 10
)**
+’
!
,-
!
First law of thermodynamics: Δ
E
=
Q
+
W
Heat engine efficiency: (actual)
࠵? = ࠵?/࠵?
.
// (theoretical)
࠵?
’/0
= 1 −
1
"
1
#
Second law of thermodynamics: Δ
S
≥ 0 spontaneously.
The number of ways of obtaining
n
heads out of
N
fair coin flips is
N
!/[
n
!(
N
-
n
)!].
Ideal gas:
pV
=
Nk
B
T
, Δ
E
= 3
Nk
B
T
/2.
Snell’s law:
n
1
sin
θ
1
= n
2
sin
θ
2
.
Lens equation:
*
2
=
*
3
$
+
*
3
%
Magnification:
|࠵?| = 3
3
%
3
$
3
, exact expression is
࠵? = −
3
%
3
$
=
4
%
4
$
Real image:
࠵?
5
> 0; Virtual image:
࠵?
5
< 0
Double-slit experiment: Δ
y
=
λL
/
d
.
Photons:
E
=
hf
,
fλ
=
c
,
c
= 3 × 10
8
m/s,
h
= 6.6 × 10
-34
J
°
s, (
hc
= 2 × 10
-25
J
°
m)
de Broglie wavelength:
࠵? =
4
6
=
4
’7
Electrostatic constant:
࠵?
8
= 9 × 10
9
࠵? ∙ ࠵?
:
࠵?
:
=
Point charges:
F
=
k
C
qQ
/
r
2
,
E
=
k
C
q
/
r
2
,
U
=
k
C
qQ
/
r
,
V
=
k
C
q
/
r
Electric field and potential:
E
= – d
V
/d
x
.
Parallel plate capacitor:
C
=
A
/(4π
k
C
d
).
Ohm’s law:
V
=
IR
.
Electrical power:
P
=
I
2
R
=
IV
=
V
2
/
R
RC circuit time constant:
࠵? = ࠵?࠵?
(units:
1࠵? ∙ 1࠵?࠵?࠵?࠵?࠵?
= 1 second)
NAME:______________________________________________________________________
Final Exam Page
3
Multiple Choice: Select the best answer and mark it on the bubble sheet – one point each
1.
The circuit to the right is a typical RC circuit that will
discharge when the switch is closed. Which of the following
would make such a circuit discharge more quickly?
a.
Decreasing R
b.
Decreasing C
c.
All the above
d.
None of the above
2.
In a typical cell membrane, the phospholipid bilayer acts like a parallel plate capacitor.
What part of the cell anatomy acts like a conductive wire with variable resistance?
a.
The ion channels
b.
The Na/K pump
c.
The cytoplasm
d.
The dissolved ions
e.
None of the above
3.
A
1࠵?࠵?
green laser with wavelength
550࠵?࠵?
shines for 1 second. How much energy was
in this pulse?
a.
3 × 10
!"#
࠵?
b.
1 × 10
!$
࠵?
c.
1000࠵?
d.
It’s impossible to tell without knowing how many photons there are.
4.
A
1࠵?
laser pulse made up of green photons with wavelength
550࠵?࠵?
is shone. How many
photons are in the pule?
a.
1.3 × 10
"%
b.
2.8 × 10
"&
c.
5.6 × 10
’(
d.
6.0 × 10
’$
5.
In the visible spectrum, red light has the largest wavelength and violet has the shortest.
Which color has the largest energy photons?
a.
Red
b.
Orange
c.
Yellow
d.
Blue
e.
Violet
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NAME:______________________________________________________________________
Final Exam Page
4
6.
You rub a piece of glass with wool and find that it has accumulated a charge. When you
bring the piece of glass near a neutral piece of Styrofoam,
a.
The Styrofoam is not affected because it is neutral.
b.
The Styrofoam is attracted to the glass.
c.
The Styrofoam is repelled by the glass.
7.
You rub a piece of plastic with some cloth and find that it has accumulated a charge.
When you bring the piece of plastic near a neutral metal sphere that is suspended by
insulating string,
a.
The metal is not affected because it is neutral
b.
The metal is attracted to the plastic.
c.
The metal is repelled by the plastic.
8.
Two identical charges are brought a distance of
࠵? = 1࠵?
apart and experience a repulsive
electrostatic force of
࠵? = 9 × 10
!%
࠵?
. What is the magnitude of one of the charges in
microcoulombs (
1࠵?࠵? = 10
!)
࠵?
)?
a.
0.001࠵?࠵?
b.
0.01࠵?࠵?
c.
0.1࠵?࠵?
d.
1࠵?࠵?
e.
10࠵?࠵?
9.
If two charges attract each other with a force of magnitude
࠵?
when separated by a
distance
࠵?
, how far apart should they be to attract each other with a force of magnitude
࠵?/16
?
a.
࠵?/16
b.
࠵?/4
c.
4࠵?
d.
16࠵?
10.
Given two charges, one with charge
࠵?
"
= 1࠵?
, the other with charge
࠵?
’
= 4࠵?
, which
feels a larger force of repulsion from the other?
a.
࠵?
"
b.
࠵?
’
c.
They both feel the same force.
d.
Not enough information to tell.
11.
What type of charge/charges is/are likely creating the
electric field pictured to the right?
a.
A single negative charge in the center
b.
A single positive charge in the center
c.
An electric diple
d.
A symmetric ring of positive charges
NAME:______________________________________________________________________
Final Exam Page
5
12.
In the diagram to the right, what ares the signs
of charges 1 and 2?
a.
1 is positive, 2 is negative
b.
1 is negative, 2 is positive
c.
Both 1 and 2 are positive
d.
Both 1 and 2 are negative
13.
In the same diagram, what can we say about
the magnitude of the two charges?
a.
|࠵?
"
| = |࠵?
’
|
b.
|࠵?
"
| < |࠵?
’
|
c.
|࠵?
"
| > |࠵?
’
|
d.
Not enough information
14.
There is a strong, constant electric field in some region. You then put a neutral piece of
conductive metal into the midst of the region. What will the electric field be inside the
metal?
a.
The same as it was in the region before the metal was there.
b.
Stronger, because the charges in the metal separate and amplify the field.
c.
There will be no electric field
inside the metal.
d.
Not enough information.
15.
Some electric field lines are pictured to the
right. Where is the field the weakest?
a.
A
b.
B
c.
C
d.
D
16.
When skin is wet, the human body provides an electrical resistance of about
࠵? = 1000Ω
.
If you accidentally short out a third rail to the ground on the New York Subway system
(
∆࠵? = 625࠵?)
what current will be running through your body?
a.
0.625࠵?
b.
1.600࠵?
c.
625000࠵?
d.
Not enough information, but too much current!
1
2
NAME:______________________________________________________________________
Final Exam Page
6
17.
The potential energy as a function of separation between two charged particles is shown
in the plot to the right. What can we say about the two particles?
a.
One of the particles may be
neutral.
b.
Both particles are positive.
c.
Both particles are negative.
d.
The particles have opposite
signs.
18.
In the same plot to the right, at
which of the five separations
indicated do the particles feel the
largest force
a.
A
b.
B
c.
C
d.
D
e.
E
19.
If a diffusing particle moves a typical distance of
1࠵?࠵?
in
5࠵?
, how long does it take to
move a typical distance of
4࠵?࠵?
?
a.
10࠵?
b.
20࠵?
c.
25࠵?
d.
40࠵?
e.
80࠵?
20.
In a typical double slit setup, red laser light of wavelength
650࠵?࠵?
is shown on a pair of
narrow slits that are
0.2 ࠵?࠵?
apart. The pattern from the interference is projected on a
screen
1.5࠵?
away. How far apart are the centers of the bright fringes separated from one
another?
a.
4.87࠵?࠵?
b.
0.087࠵?࠵?
c.
462࠵?
d.
136࠵?࠵?
e.
None of the above
!
"
#
$
%
r
U
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NAME:______________________________________________________________________
Final Exam Page
7
21.
A light ray moves from material 1 to material 2,
passing through a flat boundary between the two as
shown in the image. What can we say about the
refractive indexes of the two materials?
a.
࠵?
"
> ࠵?
’
b.
࠵?
"
= ࠵?
’
c.
࠵?
"
< ࠵?
’
d.
Not enough information to tell.
22.
A charged particle is in an electric field (not pictured).
The particle has a charge of
࠵? = −1.5࠵?
and it feels a
force of
࠵? = 6࠵?
pointing to the right. What is the
magnitude and direction of the electric field?
a.
9࠵?
, to the left
b.
4࠵?
, to the left
c.
4࠵?
, to the right
d.
9࠵?
, to the right
e.
None of the above
23.
A parallel-plate capacitor has a capacitance of
1࠵?
when it has a plate separation of
1࠵?࠵?
.
If a metal sheet of thickness
0.5࠵?࠵?
is placed directly in the middle of the two plates of
the capacitor and nothing else is changed, what will be the new capacitance?
a.
0.5࠵?
b.
1࠵?
c.
1.5࠵?
d.
2࠵?
True/False: Mark (A) for True or (B) for False – one point each
24.
A diffusing particle can move more quickly than a particle moving under directed motion
over very small distances.
a.
True
b.
False
25.
A system made up of two objects is in thermal equilibrium if the two objects have the
same thermal energy.
a.
True
b.
False
26.
A heat engine can be made theoretically more efficient if the cold exhaust gets hotter.
a.
True
b.
False
1
2
NAME:______________________________________________________________________
Final Exam Page
8
27.
If a chamber is filled with 100 particles, the highest entropy arrangement is 50 on the left
and 50 on the right (assuming the left and right are equally sized and have no energetic
difference).
a.
True
b.
False
28.
If you heat an ideal gas in a chamber with a fixed volume and pressure that is not closed
(meaning particles can flow in and out), the particles will be forced to rush out of the
chamber.
a.
True
b.
False
29.
At room temperature, a particle is much less likely to have lower energy than higher
energy because of the relatively high temperature.
a.
True
b.
False
30.
If an individual particle is in a region of high concentration, it is more likely to move to a
region of low concentration.
a.
True
b.
False
31.
A mass is oscillating from left to right on the end of a spring. If the period of motion is
2.0 seconds, the amount of time it takes for the mass to move from the leftmost point of
its motion to the rightmost point is 2.0 seconds
a.
True
b.
False
32.
A water wave is an example of a mixture of longitudinal and transverse waves.
a.
True
b.
False
NAME:______________________________________________________________________
Final Exam Page
9
33.
Estimation (
8 points
)
How many people in the world used their smartphone in the last hour?
Clearly state your assumptions and how you came to the numbers you estimate, since grading on
this problem will be mostly based on your reasoning, not your answer.
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For the image attached
For 1. a
Mass of metal:
Trial 1 is 35.0228 g
Trial 2 is 35.0915 g
Trial 3 is 34.0821 g
Mass of water:
Trial 1 is 20.0177 g
Trial 2 is 20.0250 g
Trial 3 is 20.0168 g
For delta t of water:
Trial 1 is 15.5 C
Trial 2 is 15.7 C
Trial 3 is 15.1 C
For delta t of metal
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Trial 2 is 80.2 C
Trial 3 is 79.5 C
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Trial 1 is 0.462
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COLLEGE OF HEALTH SCIENCES
RESULTS AND OBSERVA TIONS:
PARTI: BENEDICTS TEST FOR REDUCING SUGARS
田
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PATIENT
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RESULT and
NO.
Before: Blue-green
OBSERVATION
WHITE PRECIPITATE:
1
Normal Patient 1
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Normal Patient 2
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LIGHT GREEN
After: Green
PRECIPITA TE:
3
WHILTE AND YELLOW
Pathologic Patient 1
Before: Blue
PRECIPITATE:
After: Green
BRICK RED
Before: Blue-green
After: Brick Red
Pathologic Patient 2
PRECIPITATE:
Generalization:
Page 5 of 8
947 words
English (Philippines)
K…
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2
QUESTION 8
The mass of one mole of water is 18.02 g.
True
O False
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90
#5
16
MAR 1
23
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Please help me answer the following questions using the data I included. 1&2
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terface/acellus_engine.htm?ClassID=1467683063
Use the data below to determine the
mass ratio of iron to oxygen for
compound 2.
Compound
1
2
Et
onal Academy of Science. All Rights Reserved.
Mass Fe
(grams)
15.55
20.98
[20:1
Enter the answer that belongs in the green box.
Iron Ratio Cmpd 2
Mass O
(grams)
4.45
9.02
Sh
Enter
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ed Test
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tiple Attempts Not allowed. This test can only be taken once.
ce Completion This test can be saved and resumed at any point until time has expired. The timer will
emaining Time: 57 minutes, 15 seconds.
uestion Completion Status:
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Question 4
The standard Gibb's Free Energy (AGO) = 18.38 kJ at 25C for the reaction
HNO2 2 H+ + NO2-.
What is the value of AG if {HNO2} = 0.75 M, {H+} = 0.13M and {NO2-} = 0.07M?
%3D
%3D
%3D
Is the reaction spontaneous under these conditions?
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This is not graded, it’s for practice. Answer all of the questions.
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Hydrogen H2{"version":"1.1","math":"<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub></math>"} is ___________________________ in water.
Question options:
insoluble
soluble and a nonelectrolyte
soluble and an electrolyte
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sity o...
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Method? 7...
9
2
W
6
9
QUESTION 5
One mole of copper(II) sulfate, CuSO4, contains
2.41 x 1023
2.41 x 1024
6.02 x 1023
1.51 x 1023
4
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3
16
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moles of O.
tv
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8
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8
0.22
S
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ingsbo...
kboard...
ARED4
ethod? 7...
F2
Remaining Time: 1 hour, 22 minutes, 23 seconds.
Question Completion Status:
A Moving to the next question prevents changes to this answer.
Question 1
#
The angle of the water molecule (H₂O) is
180 degrees
120 degrees
100 degrees
90 degrees
109 degree
A Moving to the next question prevents changes to this answer.
MAR
14
80
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BIU ab x₂x²A 2. A
CURE What's in Your Water - Introduction and Prelab Ass
Layout References Mailings Review View
A A Aa A · E ·5·|==|
= = = -
Font
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Next, look at Graph 2.
Based on this graph, if you make
less than $39,524 per year, what is
the average number of hazardous
waste sites within one square mile
of you?
2295 words
What about if you make more than
$65,876 per year?
F
What does this tell you about
where hazardous waste sites might
be located, and who might be
affected by them?
English (United States)
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