Chapter 12

Question 1

When does lights occur

Answer 1

When an electron jumps from an outer orbit to an inner oribjt and it gives off energy in the visible spectrum of electromagnetic radiation

Question 2

Electromagnetic radiation is both a

Answer 2

Particle and wave it had characteristics of both

Question 3

Does electromagnetic radiation need a medium to travel through

Answer 3

No they’re transverse waves

Question 4

Speed of light

Answer 4

186,000 mi/s all waves to this speed

Question 5

Lightyr

Answer 5

Distance light travels in a yr so 186,000m/s for a yr

Question 6

One year

Answer 6

Earth makes one trip around sun

Question 7

Describe tides

Answer 7

The moon pulls the ocean and the ocean budges on sides bc the moon and earth are caught in each other’s gravity therefore two high tides and two low every day

Question 8

Why does light not follow Newtonian laws

Answer 8

Bc the speed of light is always the same speed even if the observer or source is moving

Question 9

White light

Answer 9

No such thing it’s but all the colors coming at once and our brain puts it together as being white

Question 10

What colors do human see in

Answer 10

Red green blue when they come together we see other colors

Question 11

Light waves

Answer 11

Reflect and refract

Question 12

Lenses

Answer 12

Curved pieces of glass that make image larger or smaller

Question 13

Two types of lenses and describe

Answer 13

Convex- lens bumps out in front and maginifies image (nearsighted)

Concave - caves in shrinks image for farsighted ppl

Question 14

Mirages

Answer 14

Occur when light bends as it goes between gaps between hot and cold air and produces shimmering image above blacktop

Question 15

Rainbows

Answer 15

When light is being refracted from raindrops the sun must be behind you and the storm must be in front of you

Question 16

Polarization

Answer 16

The axis of rotation of light is random it can come at any angle

Question 17

3D effect

Answer 17

Occurs when projector is projecting on two axis of rotation and it matches with the lenses in 3D glasses

Question 18

Pacemakers

Answer 18

Devices that are implanted under skin and have wires that go into two locations in the heart that makes it beat regularly.

Question 19

Broken microwaves

Answer 19

Dangerous for ppl withpacemakerds with the microwaves could leak in hot the pacemaker and screw it up

Question 20

3 types of Uv light and describe

Answer 20

UVa- harmless, used in black lights and for glow-in-the-dark things it is non-ionizing

UVb- dangerous skin cancer and sunburn ionizing
UVc - very very dangerous ionizing skin cancer used for water purification blocked by o zone

Question 21

Lasers

Answer 21

Light amplification by stimulated emission

Question 22

Who made first laser

Answer 22

Maiman

Question 23

What do lasers do

Answer 23

Have coherent light which means they organize the troughs and crests this makes the light dense bc it can be compressed without waves hitting each other

Question 24

Who measured speed of light

Answer 24

Michaelson

Question 25

Time

Answer 25

Relative to the distance and speed of the observer and source of light
Example people near click see time before ppl farther away bc light has to clinch off clock and back to us

Question 26

Time dilation

Answer 26

When the time gets stretched when objects approach speed of light

Question 27

Equation for speed

Answer 27

Speed= distance/time

Question 28

Lorentz contraction

Answer 28

When something is moving past the observer at close to the speed of light it loses dimension in the direction their traveling

Question 29

Mass increase

Answer 29

When objects as they approach the speed of light their mass becomes the mass of the entire universe
Speed of light=mass of universe

Question 30

Gravity

Answer 30

A distortion of the time space continuum caused by the fact that there’s lots of mass. Light is distorted by gravity