Physics 235 Spring 2016
Exam 3: June 16, 2016
Form 1
Physics 235 Spring 2016: Exam 3
Form #1
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Instructions
1.
Fill in your name above
2.
Fill in your
name
,
ID number
, and
form number
on your scantron sheet
3.
This will be a 90 minute, closed book exam.
4.
You may use a calculator, please do not share calculators.
5.
The exam includes 20 multiple choice questions which will be machine graded.
Each
question is worth 5 points.
No partial credit will be given.
6.
For this exam, you can bring
three
3×5” index cards with any notes you wish to have. You
may use a plastic ruler if you wish.
You will also find physical constants that you might
require listed below.
7.
Please take your exam booklet with you and keep it safe and unaltered.
Constants you might need:
9
22
9.0 10 Nm / C
k
=
×
12
2
2
0
8.85 10
C /Nm
ε
−
=
×
g
= 9.8 m/s
2
T m/A
Proton charge:
19
1.6 10
C
e
−
=
×
Mass of the proton:
27
1.67 10
kg
p
m
−
=
×
Mass of the electron:
31
9.11 10
kg
e
m
−
=
×
Atomic Mass Unit:
27
1 amu 1.66 10
kg
−
=
×
Speed of sound in air
= 340 m/s
Speed of light in vacuum
= 3.0×10
8
m/s
23
5
1.38 10
J/K
8.62 10 eV/K
B
k
−−
=
×=
×
Planck’s constant:
34
15
6.626 10
Js
4.136 10
eVs
h
=
×
0 °C = 273.15 K
1 electron volt (1eV) = 1.6×10
19
J
23
6.02 10 / mol
A
N
=
×
Threshold of hearing =
12
10
−
W/m
2
centi (c) = 10
2
, milli (m) =
3
10
−
,
micro
6
( ) 10
µ
−
=
, nano (n)
9
10
−
=
,
pico (p) =
12
10
−
, femto (f) =
15
10
−
,
kilo (k)
3
10
=
, mega (M) =
6
10 ,
giga (G)
9
10
=
1 Å=10
10
m
7
0
4
10
µπ
−
=
×
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1.
If the light has
?
=500 nm and the passes through a diffraction grating with a spacing of
±
=0.010 mm, what will be the distance from the central bright spot to the first order
diffraction maximum on a screen 10 m away?
A.
10 m
B.
50 cm
C.
500 nm
D.
5 mm
E.
500
²
m
The angle is given by
sin
³
= 1
?
/
±
is small, 2.9 degrees, so you can use the small angle
approximation.
´
µ
=
¶
·
→ ¸
=
µ¶
·
= 0.50
m.
Answer B.
2.
For approximately what sound frequency will the phase difference between your ears be
45
°
if the source of sound is to the side of your head?
(The sound travel through air, not
your head)
3.
A simple magnifier had a focal length
f
= +5.0 cm.
A 2cm tall butterfly is held 4.0 cm
from the lens. What is the height of the image (positive being erect, negative inverted)?
−
À
¿
À
= +
20cm
4cm
= +5
.
For
Á
= 2cm,
Á
′
= +10
cm.
Answer D.
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 Spring '08
 Mckay
 Physics

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