Light

Question 1

What type of wave is light

Answer 1

Light is a transverse wave. This means that the medium moves perpendicular to the wave.
Light doesn’t need a medium to travel. It consists of alternating electric and magnetic fields

Question 2

What evidence is there that light is made up of particles

Question 3

What are photons

Question 4

List the Electromagnetic Spectrum from Longest to Shortest

Question 5

What are uses for radio waves

Answer 5

Radio Waves: AM and FM radio, television, broadcasting, radar, aircraft navigation

Question 6

Infrared Waves (Uses)

Answer 6

Microwaves: Atomic and molecular research, microwaves, microwave ovens

Question 7

What are uses for Visible Light

Question 8

What are uses for ultraviolet light

Answer 8

Ultraviolet Light: Sterilizing medical instruments, identifying fluorescent minerals

Question 9

What are uses for X Rays

Answer 9

X-Ray: Medical examinations of bones, teeth, organs, and cancer treatments

Question 10

What are uses for gamma rays

Answer 10

Gamma Ray: Food Irradiation, studies of structural flaws in thick materials

Question 11

As you change wavelength what happens

Question 12

In visible light, if you change the amplitude,

Question 13

Define the following words

Question 14

Absorbed

Answer 14

The light is taken in by some mass

Question 15

Reflected:

Answer 15

Use the law of reflection, and you see that the light bounces off in another
direction

Question 16

Scattered:

Question 17

Refracted::

Question 18

Transmission:

Answer 18

Is the ability of light to pass through something. It will usually go through
something with a low index of refraction.

Question 19

Why is the Sky Blue?

Answer 19

More energetic waves scatter better. This is more towards the ultraviolet part. When light
shines down onto the earth, the parts of the visible spectrum scatter. Molecules in the atmosphere
absorb and scatter light. Less energetic light tends to not scatter as much. In addition, it will get
absorbed.

Question 20

EXAMPLES OF DEFINITIONS

1. A rock will absorb all colors of light.
2. Glass reflects light
3. Light reflecting on tin foil will scatter it
4. The eye refracts light
5. Thin Cotton will transmit light

Answer 20

In order, absorbed, reflected, scattered, refracted, transmited

Question 21

Opaque

Question 22

Transparent:

Answer 22

having the property of transmitting raysof light through its substance so
that bodies situated beyond or behind can be distinctlyseen.

Question 23

Translucent:

Question 24

To see an object as a particular color,

Answer 24

To see an object as a particular color, light, that color must be reflected back to your eyes,
while the other colors are absorbed. For example, in a leaf, visible light shines down on it,
however, all of the other colors are absorbed while only green reflects back.

Question 25

What are the additave and subtractive properties

Answer 25

When you mix primary colors ( red, green, blue), you can create new colors. This is the same
with light. When you mix primary colors, you can create secondary colors such as Yellow, Cyan,
and Magenta. These are called the additive primary colors. Subtractive primary colors are
essentially the secondary colors that can be combined to create green, red, and blue. If all of
the pigments of the there colors are combined, (secondary) then the light is absorbed and you
get black

Question 26

What are primary colors

Question 27

What color light refracts the most ( relate rainbows and prisims)

Answer 27

Violet light refracts the greatest amount of light. This is because of Violet Light’s

wavelength. When white light passes through a prism, all of the colors bend, and then the
light seperates. This is called dispersion. In a rainbow, the light hits the water droplets in the
sky and disperses. Because all of the parts of light disperse at different angles, you are able
to see them.

Question 28

What is evidence that infrared light is also light

Question 29

Dopplar Effect

Answer 29

The Doppler Effect can be observed with light. This happens when there is a moving object
that is going. When something is moving, the light is traveling at a constant, the rate that it is
traveling at also depends on the velocity. If a bug is making a noise and coming close to you,
the time that it makes the noise is constant. But it is approaching you, so the waves don’t
have to travel as far to reach you, thus you will get a shorter wavelength which means a
higher frequency. But on the other side, the bug is moving away from you, so that means it
has to travel further, giving it a longer wavelength and thus a lower frequency.

Question 30

PolarizedLight

Answer 30

Light is always magnetic in the y axis and electric in the x axis. But, the electric field is going
all around in different directions. The electric field travels in the x and y coordinate plane.
So, what a polarizer does is limit the electric field to one specific part, and the light that
passes through that is what you see. Polarized sun glasses means that it only allows light from
a specific direction.