Demonstration: gamma radiation is part of the electromagnetic spectrum. It is not absorbed by the air, but its intensity...

Practical Activity 14-16

As light spreads out from a source, its intensity decreases due to the processes of absorption and spreading.

Teaching Guidance 14-16

The focus of this episode is the properties of ionizing radiation. It is a good idea to introduce these through a...

Lesson 16-19

This episode considers the ways in which the intensity of radiation decreases with distance from the source.

Lesson 16-19

On the one hand pupils are quite prepared to accept that light can travel 150 million kilometres from the Sun to the Earth and...

Teaching Guidance 11-14