montes (dam2772) – Homework11 – shih – (56310)
1
This
printout
should
have
20
questions.
Multiplechoice questions may continue on
the next column or page – find all choices
before answering.
001
10.0points
For the following types
radio waves
infared radiation
visible light
ultraviolet radiation
gamma radiation
of
electromagnetic
radiation,
how
do
the
wavelength,
frequency,
and photon energy
change as one goes from the top of the list
to the bottom?
Wavelength
Frequency
Photon Energy
1.
Decreases
Decreases
Increases
2.
Increases
Decreases
Increases
3.
Increases
Decreases
Decreases
4.
Decreases
Increases
Increases
cor
rect
5.
Increases
Increases
Increases
Explanation:
The wavelength decreases from the top of
the list to the bottom, so the frequency
f
=
v
λ
increases, as does and the photon energy
E
=
h f
.
002(part1of3)10.0points
Consider the four lowest energy levels shown
in the diagram of a certain atom.
n
= 1
n
= 2
n
= 3
n
= 4
How many spectral lines will result from all
possible transitions among these levels?
1.
8
2.
None of these
3.
4
4.
5
5.
6
correct
Explanation:
n
= 1
n
= 2
n
= 3
n
= 4
003(part2of3)10.0points
Which transistion corresponds to the lowest
frequency light emitted?
1.
n
= 4 to
n
= 1
2.
None of these
3.
n
= 3 to
n
= 2
4.
n
= 4 to
n
= 3
correct
5.
n
= 4 to
n
= 2
Explanation:
The lowest frequency occurs going from
n
=
4 to
n
= 3.
004(part3of3)10.0points
Which transistion corresponds to the highest
frequency light emitted?
1.
n
= 3 to
n
= 2
2.
n
= 4 to
n
= 3
3.
None of these
4.
n
= 4 to
n
= 2
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montes (dam2772) – Homework11 – shih – (56310)
2
5.
n
= 4 to
n
= 1
correct
Explanation:
The highest frequency occurs going from
n
= 4 to
n
= 1.
keywords:
005(part1of3)10.0points
An electron is in the
second
Bohr orbit of
hydrogen.
Find the speed of the electron. The value
of ¯
h
is 1
.
05
×
10

34
J
·
s
.
The Bohr radius is
5
.
29
×
10

11
m.
Correct answer: 1
.
08939
×
10
6
m
/
s.
Explanation:
Let :
n
= 2
,
¯
h
= 1
.
05
×
10

34
J
·
s
,
m
= 9
.
11
×
10

31
kg
,
and
a
0
= 5
.
29
×
10

11
m (Bohr radius)
.
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 Spring '10
 TSOI
 Physics, Work, Photon, Correct Answer, ev, Montes

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