3.3.32
General Principles of Radiation
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Radiation
Infra-red radiation can transfer thermal energy without a medium (substance to travel through). All bodies (objects) emit radiation.
Infra-red radiation can transfer thermal (heat) energy without needing a medium (a substance to travel through). All bodies (objects) emit radiation.

Electromagnetic wave
Infra-red radiation is a type of electromagnetic wave.
It is part of the electromagnetic spectrum.
We cannot see infra-red radiation, but we can feel it as heat.

The Sun
The Sun emits infra-red radiation, which transfers thermal (heat) energy to the Earth.
Since infra-red radiation does not need a medium, it can travel through space.
1Biology
1.1Cells, Tissues & Organs
1.2Reproduction & Variation
1.3Ecological Relationships & Classification
1.4Digestion & Nutrition
1.5Plants & Photosynthesis
1.6Biological Systems & Processes
2Chemistry
2.1Particles
2.2Chemical Reactions
2.3Atoms, Elements, Compounds
2.4The Periodic Table
2.5Materials & the Earth
2.6Reactivity
2.7Energetics
3Physics
3.1Energy
3.2Forces & Motion
3.3Waves
3.4Electricity & Magnetism
3.5Matter
4Disciplinary Knowledge
4.1Thinking Scientifically
Jump to other topics
1Biology
1.1Cells, Tissues & Organs
1.2Reproduction & Variation
1.3Ecological Relationships & Classification
1.4Digestion & Nutrition
1.5Plants & Photosynthesis
1.6Biological Systems & Processes
2Chemistry
2.1Particles
2.2Chemical Reactions
2.3Atoms, Elements, Compounds
2.4The Periodic Table
2.5Materials & the Earth
2.6Reactivity
2.7Energetics
3Physics
3.1Energy
3.2Forces & Motion
3.3Waves
3.4Electricity & Magnetism
3.5Matter
4Disciplinary Knowledge
4.1Thinking Scientifically
Practice questions on General Principles of Radiation
Can you answer these? Test yourself with free interactive practice on Seneca — used by over 10 million students.
- 1How can we detect infra-red radiation?Multiple choice
- 2
- 3Why does the Sun make us feel warm?Multiple choice
- 4
- 5
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