Radiation

Test yourself

Radiation

Infra-red radiation can transfer thermal energy without a medium (substance to travel through).

Electromagnetic wave

Infra-red radiation is an electromagnetic wave (it is part of the electromagnetic spectrum).
We cannot see it but we do feel it as heat.

The Sun

The infra-red radiation emitted by the Sun transmits thermal (heat) energy to the Earth.
Infra-red radiation does not need a medium, so can still travel through space.

Radiation & Surface Colour

Surfaces can either reflect, absorb (take in), or emit (give out) infra-red radiation. Good absorbers (taker inners) of infra-red radiation are usually bad reflectors of infra-red radiation.

White surfaces

White surfaces are good reflectors of infra-red radiation.
White surfaces are poor emitters and absorbers of infra-red radiation.

Black surfaces

Black surfaces are good emitters, good absorbers and poor reflectors.

Shiny surfaces

Shiny surfaces of a colour are poorer absorbers of radiation than dull surfaces of the same colour.
Shiny surfacers are poorer emitters and better reflectors than dull surfaces of the same colour.

1Biology

1.1Practicals

1.1.1Microscope & Bacteria

1.1.2Bacteria

1.1.3Osmosis Tests

1.1.4Osmosis & Food Tests

1.1.5Enzymes

1.1.6Enzymes 2

1.1.7Photosynthesis & Plant Responses

1.1.8Photosynthesis Experiments

1.1.9Reaction Time

1.1.10Quadrats

1.1.11Decay

2Chemistry

2.1Practicals

2.1.1Salts

2.1.2Neutralisation

2.1.3Titration

2.1.4Electrolysis

2.1.5Electrolysis 2

2.1.6Rate of Reaction

2.1.7Rate of Reaction 2

2.1.8Chromatography

2.1.9Identifying Gases

2.1.10Identifying Gases 2

2.1.11Identifying Ions

2.1.12Carbonates, Halides & Sulfates

2.1.13Flame Emission Spectroscopy

2.1.14Water Purification

2.1.15Water Purification 2

3Physics

3.1Practicals

3.1.1Specific Heat Capacity

3.1.2Thermal Capacity & Insulation

3.1.3Latent Heat

3.1.4Resistance & Current

3.1.5Resistance & Current 2

3.1.6Density

3.1.7Density 2

3.1.8Force & Extension - Springs

3.1.9Waves - Ripple Tank

3.1.10Light

3.1.11Light Reflection & Refraction

3.1.12Radiation

3.1.13Radiation 2

Jump to other topics