Curriculum
Course: Alhussan Physics — Stage 9
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Curriculum

Alhussan Physics — Stage 9

Chapter 11: Forces and Density

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Chapter 12: Energy Transfer

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Chapter 13: Sound Waves

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Chapter 14: Electrical Circuits, Resistance and Power

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Chapter 15: The Earth in Space (Universe and Stars)

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Quiz

12.5 Energy transfer: radiation — Quiz

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  • Questions count: 10
  • Passing grade: B+
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1.
Which term matches this definition? “Energy transfer by infrared waves, which can cross a vacuum.”
Conduction
Evaporation
Convection
Radiation
2.
Which surface is the best absorber and emitter of infrared?
Polished metal
Shiny silver
Bright white
Dull black
3.
Why do marathon runners use foil wraps?
Foil conducts heat away
Foil is cold
Shiny foil reflects infrared back to the body
Foil absorbs heat
4.
True or false? A person emits infrared but not visible light.
True
False
5.
Light and infrared reach Earth through space, which is a ____.
solid
vacuum
liquid
conductor
6.
True or false? Shiny surfaces are good absorbers of infrared.
True
False
7.
Hot water cooled in a black can and a shiny can. Which conclusion is correct?
Dr Dabour Hub Academy - figure 1
Both cool equally
Neither cools
The shiny can cools faster
The black can emits infrared faster, so it cools faster
8.
In 25 minutes the black can cooled from 80 °C to 43 °C. What was the temperature drop?
37°C
80°C
43°C
123°C
9.
Temperature of a dull black can left in sunlight. Which graph is correct?
Dr Dabour Hub Academy - figure 2
A
B
C
D
10.
Why does the wire of a torch bulb emit light?
It is black
It reflects light
It is cold
It is very hot
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Part of Chapter 12: Energy Transfer — see every lesson and quiz in this unit.
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