Explain how radiation travels.

How does electromagnetic radiation transfer energy?

The ________ the frequency of electromagnetic radiation, the _____ energy is transferred by each photon.

List the electromagnetic radiations in order of the energy transferred by each photon.

How quickly does each type of electromagnetic radiation travel through space?

What is the intensity of a beam of electromagnetic radiation?

What is the energy transferred dependent on?

Why does the intensity of a beam of electromagnetic radiation decrease with distance from the source?

What is ionisation?

Which types of electromagnetic radiation are ionising?

The _______ ________ of absorbed radiation can damage living cells.

What issues do some people have with low-intensity microwave radiation.

Explain how microwaves can be used to heat a potato.

How are microwave users protected from radiation?

What do radioactive materials emit?

What does the ozone layer do?

How does the ozone layer protect living organisms?

How can sun creams and clothing protect people against ultraviolet radiation?

What are the benefits of some physical barriers absorbing some ionising radiation?

All objects emit __________ ________ with a _______ ________ that ________ with ________.

The ______ is surrounded by an _______ which......

What does the electromagnetic radiation do then it is absorbed?

Explain the greenhouse effect.

What are some of the greenhouse gasses in the Earth's atmosphere?

Why, for thousands of years, was the amount of carbon dioxide in the Earth's atmosphere approximately constant?

Why has the amount of carbon dioxide in the atmosphere been steadily rising over the last two hundred years?

What are computer climate models used for?

What could global warming result in?

Why can electromagnetic radiation of some frequencies be used for transmitting information?

How can a signal be created?

What is an analogue signal?

What is a digital signal?

How can sound an images be transmitted?

How can digital information be carried?

What happens when the waves are received?

What are the advantage of digital signals over analogue signals?

What is measured in Bytes (B)?

The ______ information stored, the _______ the quality of the sound or image.

What are the other advantages of digital signals?