Curriculum
Course: IB Physics HL
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Curriculum

IB Physics HL

Theme A — Space, Time and Motion

0/125 Dr Dabour Hub Science Diagram and Course Material

Theme B — The Particulate Nature of Matter

0/105 Dr Dabour Hub Science Diagram and Course Material

Theme C — Wave Behaviour

0/73 Dr Dabour Hub Science Diagram and Course Material

Theme D — Fields

0/77 Dr Dabour Hub Science Diagram and Course Material

Theme E — Nuclear and Quantum Physics

0/89 Dr Dabour Hub Science Diagram and Course Material

Tools and Inquiry — IB Physics skills

0/43 Dr Dabour Hub Science Diagram and Course Material
Quiz

E.3.2 Background Radiation – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
Which is the largest typical natural contribution to background radiation?
Cosmic rays
Medical X-rays
Nuclear power stations
Radon gas
2.
A detector reads 40 counts per minute with the source removed and 190 counts per minute with the source in place. The corrected rate is...
40 min−1
150 min−1
230 min−1
190 min−1
3.
Why might background counts be higher on a mountain top?
Radon is more abundant
Gamma rays are stronger
Less air shields cosmic rays
Detectors are more sensitive
4.
A student plots count rate against time for a decaying source without subtracting background. The graph will...
level off at the background rate
fall to zero
rise
show a straight line
5.
Which counting change most reduces the fractional uncertainty of a background measurement?
Counting for a shorter time
Counting for a longer time
Moving the detector closer to the source
Using a stronger source
6.
Which of the following is an artificial source of background radiation?
Potassium-40 in food
Granite rock
Cosmic rays
Fallout from past weapons tests
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Part of Theme E — Nuclear and Quantum Physics — see every lesson and quiz in this unit.
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