Main Ideas Flashcards
How does light travel?
Light travels in waves that have certain wavelengths.
Are all wavelengths visible to the human eye?
No, humans cannot see X-Rays, infrared waves, or radio waves.
What is the name of the empty space that light can travel through?
A vacuum
True or False
The speed of light is different in different materials.
True
Light moves in _________ lines.
straight
Light bends whenever it enters a new material. What is this bending called?
refraction
Example: When light goes from water to air
Different wavelengths of visible light are seen as ______ ________.
different colors
When all colors of visible light are mixed, the result is white light.
Why does a red apple look red?
The red light that hits the apple is reflected while the other colors are absorbed.
How are shadows formed?
When light strikes objects through which it cannot pass, a shadow is formed.
What can happen to light waves when it reaches a new material?
(4 options)
*the light waves can be absorbed
*the light waves can be reflected
*the light waves can be refracted
*the light waves can transmit (pass through) the material
True or False
Light travels much slower than sound.
False
Light travels much FASTER than sound.
What determines how much an object’s temperature increases?
*the material of an object
*the intensity of the light
*the angle at which the light strikes the surface
*how long the light shines on the object
*how much light is absorbed
Name the 3 types of materials that light can pass through.
- Transparent (nearly all light passes through)
- Translucent (lets some light pass through)
- Opaque (do not let light pass through)
