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

B.2.2 The Solar Constant – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
The solar constant is defined as the
total power emitted by the Sun
mean solar power per unit area at the top of Earth's atmosphere perpendicular to the beam
power absorbed by Earth's surface
average intensity at ground level
2.
A planet is twice as far from a star as Earth is. The intensity of starlight there, compared with Earth's, is
1/2
2
1/8
1/4
3.
Why is the average intensity over the whole of Earth S/4 rather than S?
Earth intercepts power over πR² but the power is spread over 4πR²
The atmosphere absorbs three quarters of the light
Only a quarter of the Sun's disc is visible
Earth's albedo is 0.75
4.
The intensity from a point source is 80 W m−2 at 5.0 m. At 20 m it is
20 W m−2
10 W m−2
5.0 W m−2
1.3 W m−2
5.
A star has luminosity 2.0 × 1027 W. The intensity at 1.0 × 1012 m is approximately
2.0 × 103 W m−2
1.6 × 101 W m−2
1.6 × 104 W m−2
1.6 × 102 W m−2
6.
A graph of intensity I against 1/d2 for a point source is
a straight line through the origin with gradient L/4π
a curve falling to zero
a straight line with gradient 4πL
a horizontal line
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Part of Theme B — The Particulate Nature of Matter — see every lesson and quiz in this unit.
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