Junior Lyceum Annual Examinations In Physics Form 5 - 2011 Page 8
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117.
This question is about Nuclear Physics.
14
C
Carbon-14 is a radioactive substance. The symbol for a carbon-14 nucleus is
6
a.
Using this information about Carbon -14 determine its:
i.
1
proton number Z,
__________
ii.
1
mass (nucleon) number A,
__________
iii.
1
neutron number N.
__________
b.
Carbon-14 decays by emitting beta particles. Write down the:
i.
1
symbol for a beta particle,
__________
ii.
1
mass (nucleon) number of a beta particle,
__________
iii.
1
charge of a beta particle.
__________
c.
There are three naturally occurring isotopes of carbon on Earth: 99% of the carbon is
carbon-12, less than 1% is carbon-13, and carbon-14 which occurs in very small
amounts.
i.
1
Explain the term ‘isotope’.
ii.
The following symbols represent six nuclei.
40
41
12
39
40
A
B
C
D
E
18
19
6
19
20
1
Which nuclei are isotopes of each other?
d.
A radioactive detector connected to a counter gives a count even through a radioactive
source is not present.
i.
1
This radioactive count is due to _________________________
ii.
State two sources of this radiation.
2
iii.
Name the instruments used to detect and measure background radiation rate.
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Page 8 of 11
Physics – Junior Lyceum – Form 5 – 2011
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