Science * Unit C Review Flashcards
Science (42 cards)
How did Pythagoras think light and sight worked?
He believed we shot out light beam from out eyes
What was Pythagoras’ main flaw of his theory
If it were true we could see in the dark
What property of light did Sir Isaac Newton demonstrate
White light separates into colored light
How did Albert A. Michelson determine the speed of light
He put two mirrors on a mountain top and timed how long it took for the light to bounce back and fourth.
What are four property of light
- light travels in straight lines
- light can be reflective
- light can bend
- light is a form of energy
What are two differences between a microscope and a telescope
A microscope magnifies light using lenses. A telescope uses concave lenses. A telescope is for viewing small things like bacteria and a telescope is used for viewing stars.
What would you use to look at a distant mountain?
A telescope or binoculars
Why does a shadow get bigger when what is making it moves toward the light source.
The closer it gets the more rays it blocks off
Give an example of something transparent
Glass
Give an example of something translucent
wax paper
Give an example of something Opaque
brick
Give an example of something luminous
firefly
How does diffuse reflection occur?
It is the scattered light rays reflecting in different directions after they hit a surface
Why does paper not reflect
It is not 100% smooth
What is the law of reflection
A smooth surface allows incoming rays to bounce off as a parallel beam
What type of mirror will focus light onto a single point
concave
Name three devices that use concave mirrors
Headlights, flashlights, telescopes
What happens to an image produced by a convex mirror?
It is always upright and smaller than the original
How is the speed of light related to refraction
Refraction is ending light between mediums. This refraction is because the speed of light differs is different materials
What happens to light when it passes through a concave lens?
It diverges light
What happens to light when it passes through a convex lens
It converges light.
What does the frequency of a wave refer to?
How many times the medium vibrates in a set amount of time
The colors of visible light from longest to shortest are
red orange yellow green blue violet
What are the different types of waves in the electromagnetic system
radio waves, microwaves, infra- red waves, visible light, ultraviolet light, x-rays, gamma rays
