Munoz (gm7794) – HW13 – TSOI – (92515)
1
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printout
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have
12
questions.
Multiplechoice questions may continue on
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before answering.
001
(part 1 of 2) 10.0 points
A hypothetical atom has four energy states as
shown.
0

1

2

3

4

5

6

7

8
n
= 4
n
= 3
n
= 2
n
= 1
Energy (eV)
Which of the following photon energies
E
ν
could NOT be found in the emission spectra
of this atom after it has been excited to the
n
= 4 state?
1.
E
ν
= 2 eV
2.
E
ν
= 1 eV
3.
E
ν
= 4 eV
correct
4.
E
ν
= 5 eV
5.
E
ν
= 3 eV
Explanation:
By subtraction, the transition from
n
= 4
to
n
= 3 would release 1 eV; from
n
= 4
to
n
= 2 would release 3 eV; from
n
= 3 to
n
= 2 would release 2 eV; from
n
= 3 to
n
= 1
would release 5 eV. The only choice remaining
is
4 eV
.
002
(part 2 of 2) 10.0 points
Which of the following transitions will pro
duce the photon with the longest wavelength?
1.
n
= 4
to
n
= 3
correct
2.
n
= 3
to
n
= 2
3.
n
= 3
to
n
= 1
4.
n
= 4
to
n
= 1
5.
n
= 2
to
n
= 1
Explanation:
The
longest
wavelength
is
produced
in
the case where the least amount of energy
is released.
That is,
in this case,
from
n
= 4 to
n
= 3
.
003
10.0 points
In an experiment, light of a particular wave
length is incident on a metal surface, and
electrons are emitted from the surface as a
result.
To produce more electrons per unit time
but with less kinetic energy per electron, the
experimenter should do which of the follow
ing?
1.
Decrease the intensity and increase the
wavelength of the light
2.
Decrease the intensity and the wavelength
of the light
3.
Increase the intensity and the wavelength
of the light
correct
4.
Increase the intensity and decrease the
wavelength of the light
5.
None of these would produce the desired
result.
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 Summer '08
 morrison
 Physics, Energy, Photon, ev, Munoz

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