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Memo > Science * Unit C Review > Flashcards

Science * Unit C Review Flashcards

Science

1
Q

How did Pythagoras think light and sight worked?

A

He believed we shot out light beam from out eyes

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2
Q

What was Pythagoras’ main flaw of his theory

A

If it were true we could see in the dark

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3
Q

What property of light did Sir Isaac Newton demonstrate

A

White light separates into colored light

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4
Q

How did Albert A. Michelson determine the speed of light

A

He put two mirrors on a mountain top and timed how long it took for the light to bounce back and fourth.

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5
Q

What are four property of light

A
  • light travels in straight lines
  • light can be reflective
  • light can bend
  • light is a form of energy
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6
Q

What are two differences between a microscope and a telescope

A

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.

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7
Q

What would you use to look at a distant mountain?

A

A telescope or binoculars

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8
Q

Why does a shadow get bigger when what is making it moves toward the light source.

A

The closer it gets the more rays it blocks off

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9
Q

Give an example of something transparent

A

Glass

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10
Q

Give an example of something translucent

A

wax paper

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11
Q

Give an example of something Opaque

A

brick

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12
Q

Give an example of something luminous

A

firefly

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13
Q

How does diffuse reflection occur?

A

It is the scattered light rays reflecting in different directions after they hit a surface

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14
Q

Why does paper not reflect

A

It is not 100% smooth

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15
Q

What is the law of reflection

A

A smooth surface allows incoming rays to bounce off as a parallel beam

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16
Q

What type of mirror will focus light onto a single point

A

concave

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17
Q

Name three devices that use concave mirrors

A

Headlights, flashlights, telescopes

18
Q

What happens to an image produced by a convex mirror?

A

It is always upright and smaller than the original

19
Q

How is the speed of light related to refraction

A

Refraction is ending light between mediums. This refraction is because the speed of light differs is different materials

20
Q

What happens to light when it passes through a concave lens?

A

It diverges light

21
Q

What happens to light when it passes through a convex lens

A

It converges light.

22
Q

What does the frequency of a wave refer to?

A

How many times the medium vibrates in a set amount of time

23
Q

The colors of visible light from longest to shortest are

A

red orange yellow green blue violet

24
Q

What are the different types of waves in the electromagnetic system

A

radio waves, microwaves, infra- red waves, visible light, ultraviolet light, x-rays, gamma rays

25
Q

What is one thing that depends on electromagnetic wave to operate

A

MRI

26
Q

What is the difference between incandescent and fluorescent light

A

Incandescent bulbs use filament. fluorescent bulbs are filled with a small amount of gas.

27
Q

What advantage does fluorescent light have over incandescent light?

A

Produce less waste; they are more efficient. 80% of energy is lost instead of 90%

28
Q

What are the primary colors of light?

A

Red, blue, green

29
Q

What colors form yellow?

A

red & green

30
Q

What colors form cyan

A

blue & green

31
Q

What colors form magenta

A

red & blue

32
Q

What is the purpose of the iris

A

adjusts the amount of light entering the eye

33
Q

What is the purpose of the pupil

A

lets light in

34
Q

What is the purpose of the lens

A

focus lite on retina of film

35
Q

What is the purpose of the retina

A

gathers light and produces an image

36
Q

What causes near sightedness

A

The eye is too long . Concave lenses

37
Q

Nocturnal animals usually can’t see color why?

A

They have more rods than cones.

38
Q

How is a compound eye different from a “camera eye” What advantage does this provide insects?

A

Compound eyes only see the difference between light and dark. It allows them to see 360

39
Q

How are digital images produced and stored

A

Pictures are made up of pixels. Each pixel is a different color

40
Q

What causes low resolution in a digital image

A

fewer pixels

41
Q

What is the disadvantage of having a good picture?

A

It takes up more memory

42
Q

Why do satellites rely on digital images

A

Instant results; satellites transport images much quicker

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