Properties of Light
How does light travel?
Light travels as a wave in a straight path.
Give an example of a natural light source.
Must be light that comes from nature, i.e the sun, fire, etc.
What colours make up white light?
All the colours of the rainbow (red, orange, yellow, green, blue, indigo, violet)
What is a shadow?
A shadow is a dark area created when an object blocks light.
What is reflection?
Reflection is when light bounces off a surface.
Give an example of an artificial light source.
What is a prism?
A prism is a transparent object that bends light and can separate it into colours.
Name an opaque object.
Objects will vary - must not let any light through i.e. table, brick, etc.
What is refraction?
Refraction is the bending of light as it passes from one medium to another
What do we call it when a source can give off light?
Emit
How do we see colours?
We see colours based on the wavelengths of light that are reflected off objects.
Name a transparent object.
Objects will vary - must let all light through i.e. windows, plastic, etc.
Name the speed of light?
approximately 300 000 kilometers per second.
Give an example of a source of light that does not also give off heat.
Answers may include fireflies, LED lights, glow sticks, etc.
What is the colour of light that is reflected by a green leaf?
The colour green is reflected.
What happens to a shadow when the light source moves?
The shadow will move and change shape based on the new position of the light source.
What is light?
Light is a form of electromagnetic energy that can be seen by the human eye.
Describe the role of fire as a light source
Fire produces light and heat through combustion.
Explain what happens when light hits a coloured object.
The object reflects the colour we see and absorbs all other colours.
Name a translucent object.
Objects will vary - must let some light through i.e. wax paper, water, etc.