Lesson: Light

Science Differentiation in action

What is this called?

Crooke’s radiometer.

What does it show?

Light is a form of energy.

Science Differentiation in action

The sun is a source of energy.

Light is a form of energy.

Science Differentiation in action

Can you recall the Law of Conservation of Energy?

Energy cannot be created or destroyedbut it can be changed from one form into another.

Solar cell

Light Electricity

Science Differentiation in action

Light travels at 300 million metres per second.

For example, it takes about 1.3 seconds for light from earth to reach the moon.

Science Differentiation in action

Luminous objects make their own light.

Can you name some?

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Stars are luminous.

Science Differentiation in action

We see non-luminous objects because they reflect light.

Science Differentiation in action

What does this experiment show?

Observer

Light bulb

Card with a small hole in

it’s centre

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How are shadows formed?

Light bulb Object

Shadow

Screen

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What does this picture show?

How is it formed?

Science Differentiation in action

1. Light is a form of _________.

Review Questions

2. Light travels in ___________ lines.

3. Name this piece of equipment.

Science Differentiation in action

What colour is the light from the sun?

Question to think about!