Physics Annual Examinations For Secondary Schools Form 5 - Directorate For Quality And Standards In Education, 2013 Page 9
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1210.
This question is about radioactivity .
a.
Complete the following statements:
i.
Proton number Z is the number of __________ in the nucleus of an atom.
(1)
ii.
Nucleon number A is the number of protons and __________ in the nucleus of an atom.
(1)
b.
Carbon-14 and carbon-12 are isotopes.
i.
Explain the term isotopes. ________________________________________________
________________________________________________________________________________
(2)
ii.
The proton number of carbon-12 is 6. Fill in the following
symbol of carbon-12 by writing its proton and nucleon number.
(2)
c.
A student observed that with the appropriate instruments a reading is obtained even through a
radioactive source is not present.
i.
This count is due to ____________________ radiation
(1)
Name two sources of this radiation.
ii.
________________________________________________________________________________
(2)
iii.
Name the instrument used to detect this radiation rate.
________________________________________________________________________________
(2)
d.
Paula and Andrea set up the necessary apparatus to find the half-life of an unknown
radioactive substance X. They notice that at the beginning of the experiment the apparatus
gives a count of 16 counts per minute. When X is brought near the apparatus the count rate
increases to 816 counts per minute.
i.
What is the count rate due to the radioactive substance X only?
_________________
(1)
ii.
Explain the term ‘ half-life ’.
________________________________________________________________________________
(2)
iii.
After 5 minutes, the count rate due to the radioactive substance only, drops to 400
counts per minute. Find its half-life .
________________________________________________________________________________
(2)
iv.
What would be the count rate due to the radioactive substance only after 10 minutes?
________________________________________________________________________________
(2)
v.
Give the total count rate given by the apparatus after 10 minutes.
________________________________________________________________________________
(2)
Physics – Secondary Schools – Track 2 - Form 5 – 2013
Page 9 of 12
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