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.

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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.

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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.

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

2.8Properties of Materials

3Physics

3.1Energy

3.2Forces & Motion

3.3Waves

3.4Electricity & Magnetism

3.5Matter

3.6Space Physics

4Disciplinary Knowledge

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