Show:
Light
Materials
Reflection
Refraction
Heat
100
Torches and candles are examples of _________ sources of light.
Artificial.
100
Glass is an example of a ____________ material.
Transparent.
100
What occurs when light hits an object and bounces back?
Reflection.
100
What occurs when light changes direction as it passes from one substance to another?
Refraction.
100
Are metals good insulators or conductors?
Conductors.
200
How many colors make up white light?
Seven (the colors of the rainbow).
200
Sunglasses are an example of a _________ material.
Translucent.
200
Which object is the best reflector?
A mirror.
200
Name two examples of lenses.
Examles: Microscopes, glasses, magnifying glasses, telescopes, binoculars, cameras.
200
This is the type of energy we need to add to a substance to heat it.
Thermal energy.
300
In what direction does light travel?
A straight line.
300
These types of materials do not allow any light to pass through them, so we cannot see through them.
Opaque materials.
300
When light hits a smooth surface all the rays reflect in _________ direction.
The same.
300
What is the name for pieces of curved glass or plastic which refract light?
Lenses.
300
The name for materials which don't transfer heat very effectively.
Thermal insulators.
400
Which form of energy travels the fastest?
Light.
400
These types of materials allow light to pass through them, so we can see clearly through them.
Transparent materials.
400
Besides a mirror, name two other types of reflectors.
A window, the surface of a lake.
400
What is the subject through which light travels called?
A medium.
400
The name for materials which transfer heat quickly and effectively.
Thermal conductors.
500
How fast does light travel?
300 000 kilometers per second.
500
These types of materials allow some light to pass through, so we can partially see through them.
Translucent.
500
When light hits a rough surface all the rays reflect in _________ directions.
Different.
500
Why does a straw in a glass of water appear to bend when it hits the water's surface?
Because water and air have different densities.
500
The process in which the thermal energy in a solid increases, and it becomes a liquid.
Melting (when ice cream melts it becomes a liquid).