Grade 12 Atomic Nucleus,Atomic Models written question 

Total 6 question

Need to be print off and hand writing then scan it back as pdf file 

Formula sheet provided as the file “datasheet “

Question file called U5 written and U6written 

1

Physics 30 Unit

5

Atomic Structure Exam Part B

Name: __________________ Date: ________________

Written Response #1

Use the following information to answer the next question.

• Draw the electric field lines showing the electric field direction and shape

between the parallel plates above. (1 mark)

• Determine the magnitude and direction of the acceleration on the charged
particle. (4 marks)

An oil-drop, that has a mass of 3.5 × 10-15 kg and an excess of 7 electrons, is located
between horizontal parallel plates. The plates are separated by a distance of 2.5 cm and
have and potential difference of 4.8 × 102 V between them.

Positively charged plate

Charged Particle Plate separation = 2.5 cm

Negatively charged plate

2

Name: ______________

• Describe one change that could be made to the above experiment so that the
charged particle will be now be suspended. Explain how the change will allow
the particle to be suspended and justify your answer with appropriate formulas
(3 marks)

• Determine the time required for the particle to move from the upper plate to the
lower plate when the particle begins at rest. (2 marks)

3

Written Response #2 Name: ____________

Use the following information to answer the next question.

The northern lights that are visible in Alberta skies on many winter nights are produced when
free electrons in the solar wind are trapped within Earth’s magnetic field.

Diagram I: Solar Wind and Earth

These free electrons can collide with atomic oxygen in the upper atmosphere. As a result of
these collisions, atoms of oxygen become excited and electrons in lower levels move to
higher energy levels. Electron transitions toward the ground state result in the emission of
photons, two of which correspond to red and green light.

The following diagram shows the three energy levels of atomic oxygen involved in the
production of green- and red-colored northern lights.

Diagram II: Selected Electron Energy Levels

In addition to the two photons identified above, a third unique photon can be emitted by
atomic oxygen after it has been excited to energy level C.

Geographic North Pole

Equator

Geographic South Pole

Solar Wind

Energy Level C

Energy Level B

Energy Level A

Electron
Transition

Electron
Transition

Photon
emission

Photon
emission

_____ eV

_____ eV

-15.82 eV Ground State

fgreen = 5.379 × 1014 Hz

fred = 4.762 × 1014 Hz

4

Name: ______________

• Draw several magnetic field lines on diagram I to show the shape, strength and
direction of the Earth’s magnetic field. (1 mark)

• Determine the energy of the photon of red light and the energy of the photon of
green light. (2 marks)

• Determine the energy values in units of electron volts for the energy level B and
energy level C of atomic oxygen. (2 marks).

If you are unable to determine the energy values for levels B and C, use the
hypothetical values of energy level B = -13.10 eV and energy level C = -11.20 eV for
the rest of the question.

• Determine the minimum speed of a free electron that would excite atomic

oxygen from energy level A to energy level B. (2 marks)

5

Name: __________

• Draw an arrow on diagram II to show the electron transition that corresponds to
the emission of the third, unique photon. (1 mark)

• Determine the wavelength of the third, unique photon, and identify the region of
the electromagnetic spectrum to which this photon belongs. (3 marks)

1

1

PHYSICS 30
Atomic Nucleus Exam WR

Name: _______________ Date: ________________

Written Response #1

Use the following information to answer the next question.

• Determine the velocity of neutron after the decay. (3 marks)

The sun produces energy through nuclear fusion. In one particular reaction, energy
is released when a hydrogen – 2 nucleus fuses with a hydrogen – 3 nucleus. This
produces a helium – 5 nucleus that is unstable and that decays to helium 4 nucleus
and a neutron. The fusion reaction chain is

HenHeHH 42
1
0

5
2

3
1

2
1 +→→+

The masses of two of these particles are given in the table below.

Particle Isotope Notation Mass (10-27 kg)
Helium – 4 He42 6.648 8

4

Neutron n10 1.674 9

3

The decay of helium – 5 to helium – 4 and a neutron forms an isolated system. In
this system, the energy equivalence of the mass defect is observed as an increase in
the system’s kinetic energy.

A helium – 5 nucleus, at rest, decay. Both the neutron and the helium – 4 nucleus
move away from the location of the decay. The helium – 4 nucleus has a momentum
of 1.903 06 × 10-20 Ns and a kinetic energy of 2.723 50 × 10-14 J.

2

2

Name: ___________________
• Determine the mass of the helium-5 nucleus. (5 marks)

3
3

Written Response #2 Name: _________________

Use the following information to answer the next questions.

• On the grid below, graph the data with the manipulated variable on the horizontal axis.
Provide a suitable title for your graph. (3 marks)

While studying the radioactive phosphorus isotope isotope P3415 , it was discovered that a 128 g
sample had decayed to 4.48 g after 60 s. The following table provides data corresponding to
the decay.

Mass (g) 128.0 73.0 41.9 23.9 13.7 7.80 4.48
Time (s) 0.00 10.0 20.0 30.0 40.0 50.0 60.0

4
4

Name: __________________

• Using your graph, or some other appropriate method, determine the half-life of
phosphorus-34. Indicate how you determined your answer. (1 mark)

• When phosphorus-34 decays, it emits a particle. An experiment similar to the J.J. Thomson
experiment is performed to determine the charge-to-mass ratio of this particle. It is found that
the particle moves undeflected through mutually perpendicular magnetic and electric fields of
2.00 × 10-3 T and 1.08 × 104 N/C, respectively. When the electric field is turned off, the particle
is found to deflect to a radius of 1.53 × 10-2m. Using the formula on the data sheets, determine
the type of particle emitted. Show all the steps needed to make this determination. (4 marks)

5

5

Name: _________________

• Using your periodic table, write the complete equation for the decay you just found,
identifying the product isotope. If you were not able to get an answer for the previous bullet,
assume an alpha decay. (2 marks)

• How would a gamma ray have been affected by passing through a magnetic field as
mentioned in the third bullet? (1 mark)

jfahy
Typewritten Text
(Note: This question is still talking about phosphorus-34. If there are two possible decays of the type you found,
just choose one of them, name it, and write its equation.)

P
H

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to
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h

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s
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c ​

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k

m
ax

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M

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​
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ri

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p
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ad

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ce

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2

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2

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a
​

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__
_
si

n
A

​​
=

b
​

__
__
_
si

n
B

​​
=

c ​

__
__
_
si

n
C

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2
+
b

2
–

2
a

b
​c

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C

S
lo

p
e

m
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∆y

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__
_
∆
x​​

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re

a

R
ec

ta
ng

le
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l
w

T
ri

an
gl

e
=

1 __

2

a
b

C
ir

cl
e

=
π

r2
C
ir

cu
m

fe
re

n
ce
C
ir
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e

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2
π

r
G
ra

p
h

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g

C
al

cu
la

to
r

W
in

d
ow

F
or

m
at

x:
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x m
in

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m

ax
, x

sc
l]

y:
[

y m
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m

ax
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sc
l]