What is Light?
Name: _________________________________
Light is a form of e___________________ . We know this because it can produce m__________________ in
the Crooke's radiometer. It can also produce e__________________ current in the photovoltaic cell.
Sources of Light
Think: Look at the diagram to the right. Why can we 'see' this book?
What do the arrows show? Discuss your ideas.
Objects can be classified as either LUMINOUS or NON-LUMINOUS.
Luminous objects are those that….
Non-luminous objects are those that …..
Complete the table using the examples below:
Examples of luminous objects
Examples of non-luminous objects
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What is Light?
Light travels as a w_______________ and is part of the e_____________________________ spectrum.
Light travels at a speed of _________________ kilometres per second in a v______________________.
The diagram below shows sunlight forming a rainbow by passing through a raindrop. The pattern of
colours formed is called the WHITE LIGHT SPECTRUM.
White light is made up of different c_______________ of light which have different w___________________.
Summary

Light is a form of __________________________ .

Light is a type of ___________________________ radiation which travels at _______________ km/s.

Light can be detected by the human ______________ and by ____________________.

__________________________ objects are those that give out their own __________________.

_______________________________ objects are those that cannot give out their own light.

They can only be seen by the light they ______________________.

White light is made up of different ________________ which are _______________, ___________________,
______________________, _____________________, ________________________, ___________________________, and
____________________________.
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