Physics Annual Examinations For Secondary Schools Form 5 - Directorate For Quality And Standards In Education, 2014 Page 5
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11b) Calculate the half-life of this radioactive isotope.
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c) When the isotope was put in a cardboard box, only the background radiation was detected.
i) Which of the following is being emitted: alpha particles, beta particles or gamma rays?
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ii) Name TWO sources of background radiation.
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7. The diagram shows a 12 V battery which causes a 2 A current to flow in the 4 Ω resistor.
12 V
R
Using the above diagram, calculate the:
a) voltage across the 4 Ω resistor
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b) voltage across the two resistors in parallel
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c) current in the 10 Ω resistor
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d) current flowing through R __________________________________________________ [1]
e) resistance of the resistor R
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f) power delivered by the battery
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[2]
Physics – Secondary Schools - Track 2 – Form 5 – 2014
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