Physics Annual Examinations For Secondary Schools Form 5 - Directorate For Quality And Standards In Education, 2013 Page 9
ADVERTISEMENT
1
2
3
4
5
6
7
8
9
10
11
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 __________and __________ in the nucleus of an
atom.
(2)
b.
Carbon-14 and carbon-12 are isotopes.
i.
Explain the term isotope.
___________________________________________________________________________
___________________________________________________________________________
(2)
ii.
The proton number of carbon-12 is 6. The symbol for carbon is C. Write down the
symbol for carbon-12 showing its proton and nucleon number.
___________________________________________________________________________
(2)
c.
A detector of radioactivity connected to a counter gives a count even though a radioactive
source is not present.
i.
This count is due to ____________________ radiation
(1)
ii.
Name two sources of this radiation.
___________________________________________________________________________
(2)
iii.
Name the instruments used to detect and measure this radiation rate.
___________________________________________________________________________
(2)
d.
Paula and Andrea set up the necessary apparatus to find the half life of an unknown
radioactive substance X. The detector records a count rate of 18 counts per minute when
switched on. The count rate increases to 1618 counts per minute when a small sample of X is
placed closer to the detector-and-counter.
i.
What is the count rate due to the radioactive substance X only?
_________________
(1)
ii.
Explain the term ‘half-life’.
___________________________________________________________________________
(2)
iii.
After 15 minutes, the count rate due to the radioactive substance only, drops to 200
counts per minute. Calculate its half life.
___________________________________________________________________________
(3)
iv.
Give the total count rate given by the rate meter after 20 minutes. ________________
(2)
Physics – Secondary Schools – Track 3 - Form 5 – 2013
Page 9 of 12
ADVERTISEMENT
0 votes
Related Articles
Related forms
Physics Annual Examinations For Secondary Schools Form 5 - Directorate For Quality And Standards In Education, 2013
Education
Physics Annual Examinations For Secondary Schools Form 5 - Directorate For Quality And Standards In Education, 2014
Education
Physics Annual Examinations For Secondary Schools Form 5 - Directorate For Quality And Standards In Education, 2012
Education
Physics Secondary School Annual Examinations Form 5 - Directorate For Quality And Standards In Education, 2011
Education
Form Mi-1040cr2 - Michigan Homestead Property Tax Credit Claim For Veterans And Blind People Instructions - 2013
Financial
Related Categories
Parent category: Education