Light & Optics

Question 1

The distance from crest to crest or trough to trough.

Answer 1

Wavelength

Question 2

The height of a wave crest or depth of a wave trough, as measured from the rest position.

Answer 2

Amplitude

Question 3

Has energy, can be seen, and is all the colours of the rainbow.

Answer 3

Visible Light

Question 4

The bending or changing direction of a wave as it passes from one material to another.

Answer 4

Refraction

Question 5

Occurs when a light wave strikes an object & bounces off.

Answer 5

Reflection

Question 6

The waves carry energy, & most waves are invisible. We need the spectrum & use it every day.

Answer 6

Electromagnetic Spectrum

Question 7

Used in radios. Has the lowest energy & longest wavelength compared to all other types of EM waves.

Answer 7

Radio Waves

Question 8

Used in microwaves. Has the shortest wavelength & highest energy of all the radio waves.

Answer 8

Microwaves

Question 9

Used in heat lamps. Has a longer wavelength, lower energy, and lower frequency compared to light.

Answer 9

Infrared Waves

Question 10

Can come from the sun. Compared to light, it has a shorter wavelength, higher energy, & higher frequency. It can help you get Vitamin D, but can also give you a sunburn.

Answer 10

Ultraviolet Waves

Question 11

Used to X ray bones. Compared to UV waves, it has a much shorter wavelength, higher frequency, & higher energy.

Answer 11

X rays

Question 12

This type of material allows light to pass through it freely. We can see through this type of material easily.

Answer 12

Transparent

Question 13

This type of material allows most light rays to get through, but scatters them in all directions. We can see through this type of material, but what we see appears blurry.

Answer 13

Translucent

Question 14

This type of material prevents any light from passing through it. We cannot see through this type of material.

Answer 14

Opaque

Question 15

The incoming ray in a light diagram.

Answer 15

Incident Ray

Question 16

The ray that bounces off the barrier in a light diagram.

Answer 16

Reflected Ray

Question 17

An imaginary line that is perpendicular to the barrier in a light diagram. It is used to help explain how waves reflect.

Answer 17

Normal Ray

Question 18

A mirror which has a reflecting surface that curves inward like the inside of a bowl or sphere. They are used for makeup as they make the reflected image look bigger than it actually is.

Answer 18

Concave Mirror

Question 19

A mirror that is curved outward, like the outside of a bowl or sphere. They are used for school bus mirrors, as they can give a wider view of the surrounding environment

Answer 19

Convex Mirror

Question 20

What are the colours of the visible light portion of the EM spectrum, listen from longest wavelength to shortest wavelength?

Answer 20

Red, Orange, Yellow, Green, Blue, Indigo, Violet

Question 21

How to convert watts to kiloWatts?

Answer 21

Divide by 1000

Question 22

How to find the kiloWatt hour?

Answer 22

Multiply kiloWatts by the number of hours

Question 23

White light is comprised of what?

Answer 23

All the colours of the rainbow

Question 24

The colour of an opaque object is determined by what?

Answer 24

The colour of light that it reflects

Question 25

Three additive primary colours

Answer 25

Red, blue & green

Question 26

What happens when you combine the three additive primary colours?

Answer 26

You get white

Question 27

Combining an additive red and green make what colour?

Answer 27

Yellow

Question 28

Combining an additive green and blue make what colour?

Answer 28

Cyan

Question 29

Combining an additive red and blue make what colour?

Answer 29

Magenta

Question 30

The cell that detects light and dark changes.

Answer 30

Rod Cells

Question 31

The cell that detects colour.

Answer 31

Cone Cells

Question 32

When your cones become defective, thus making it difficult to see colours

Answer 32

Colour Blindness

Question 33

Complementary colours of yellow

Answer 33

Red and green

Question 34

Complementary colours of cyan

Answer 34

Green and blue

Question 35

Complementary colours of magenta

Answer 35

Red + blue

Question 36

Light is made up of what?

Answer 36

Photons

Question 37

TV remotes use what kind of EM radiation?

Answer 37

Infrared waves

Question 38

What is formed when a material blocks light?

Answer 38

A shadow

Question 39

Name all types of EM radiation from longest wavelength to shortest wavelength.

Answer 39

Radio waves, microwaves, infrared rays, visible light, ultraviolet rays, x rays, and gamma rays

Question 40

The type of light that is produced from heat

Answer 40

Incandescent light

Question 41

The type of light that is produced from phosphor particles that are hit by ultraviolet rays

Answer 41

Fluorescent light

Question 42

The type of light that is produced from living organisms

Answer 42

Bioluminescent light

Question 43

The type of light that is produced similarly to that of fluorescent light, but the light source stores the light for a long time before actually emitting it

Answer 43

Phosphorescent light

Question 44

The law of reflection states what?

Answer 44

When a ray of light reflects off of a smooth surface, the angle of incidence is equal to the angle of reflection