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Flashcards in Light Deck (27)
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1

Electromagnetism doesn't ??

Need a medium to travel through bc electric wave pushes the magnetic wave and magnetic wave pushes the electric one

2

Speed of light

186,000 miles per second

3

When you see sun light it's actually an imagine from

81/2 minutes ago

4

Closest star is

2 light years away

5

Explain how the moons gravity pulls the ocean

It pulls ocean on both sides of the earth causing the ocean to bulge causing 2 high tides and 2 low tides

6

E=mc2

Energy = mass speed of light

7

Energy and mass are

Proportional

8

White light is
All colors are (how did Newton show this)

All the colors together
Pieces of white light and he used a prism and shone white light through it

9

refraction

Bending of light

10

Lens

Piece of glass that either magnifies an object or makes it smaller

11

Explain mirage

Say there's a car on the road and the sun is shining down, the hot air is rising to the cool air and the sun light bending between the warm and cool air causes a mirage

12

Double rainbows
What do you need to see a rainbow

Are opposites
Red-purple purple- red
Sun behind you and storm Infront of you

13

Polirazarion

Axis of rotation of light is random
It refeacts 1/2 the light so they all have the same axis

14

2 polarizes in opposition

Block out the light

15

Radio waves
Length
Commonly used for

Length of soccer field
Radio (am=amplitude modulation & fm=frequency modulation)
Tv
Cellphones

16

Microwaves
Shorter than
Used for

Shorter than radio waves
Microwaves
GPS (global positioning system)
Radar ( radio detection and ranging)

17

Danger or pacemakers and microwaves

Microwaves can leak and cause pacemakers to stop working and cause heart attacks

18

Infared

Heat
Just below Red visable light
You can't see it

19

Ultraviolet light

UVA - non ionizing visible light and harmless
UVB - ionizing sunburn
UVC - ionizing X-rays, blocked by our ozone in our atmosphere

20

Time dialation

Time is stretched when objects approach speed of light
Say Me.Moore was in a truck then speed would equal distance divided by time but an observer who is far away speed = DISTANCE divided by TIME since the distance is bigger the time has to be bigger to and now time is stretched and the object pictures in slow-motion

21

Light is caused by

Electrons orbiting and giving off quanta

22

If Courtney travels into space/tike travel example

If Courtney travels into space at half the speed of light and is gone for two 1/2 years. She was actually only gone for two years that I was waiting still for 2 1/2 but the time was different up in space

23

Lorenz contraction

When I basketball is moving it looks smaller and kind of distorted and if a basketball is moving at the speed of light it would look like a stick but it never loses its shape it just appears different

24

How is mass different when something is moving at the speed of light

Yes it becomes infinite flight and the mass increases but an object can never quite reach a speed of light because if I did the mass would equal the mass of the universe

25

Gravity is proportional to

Mass

26

Gravity is the distortion of

The time space continuum caused by the fact that there's so much mass

27

Maxwell and Einstein say light is a light wave and is now called

Electromagnetic radiation