What is ultraviolet light?

What is melanin?

What does a source of radiation do?

How do we see colour?

What is the ozone layer and what does it do?

Why is there a hole in the ozone?

Why is a hole in the ozone a really bad thing and what's being done?

What is a photon?

If a photon has enough energy, such as in an X-ray photon, what will it do?

If a photon doesn't have much energy, such as in visible light, what is its main effect?

How do X-rays work?

What are gamma rays mostly used for in medicine?

What are the risks of having an X-ray?

Can UV radiation cause cancer?

What happens when a material absorbs microwave radiation?

What are microwaves?

Why do some people believe mobile phones are bad for you?

What is infrared radiation?

What is the greenhouse effect?

What are the greenhouse gases?

Describe how the greenhouse effect keeps the Earth's temperature steady?

Why is the Earth's average temperature increasing?

Why is there more CO2 being released into the air?

What are the 4 predicted effects of climate change?

What continent produces the most CO2 per year? Why isn't this changed?

What is 'information'?

What is a signal?

Describe analogue signal.

Describe digital signal.

What 4 advantages do digital signals have over analogue ones?

What is 'noise' in a signal?

Why can digital signals be regenerated without noise?

Why can't analogue signals be regenerated?

What's the difference between perceived and actual risk?

In a scientific study, why do the sample groups have to be randomly picked?