Light And Waves

Question 1

What does dispersion mean?

Answer 1

The separation of white light into colours or of any radiation according to wave length

Question 2

True or False: Refraction occurs when light travels from one medium to another and changes speed.

Answer 2

True

Question 3

Fill in the blank: The bending of light as it passes from air into water is an example of ___.

Answer 3

refraction

Question 4

What do we call the effect that allows us to see colour?

Answer 4

The perception of light wavelengths by the human eye

Question 5

Which colors are typically visible in a rainbow?

Answer 5

Red, orange, yellow, green, blue, indigo, violet

Question 6

True or False: Shadows are created when an object blocks light.

Answer 6

True

Question 7

What is the term for the bouncing back of light when it hits a surface?

Answer 7

Reflection

Question 8

Which type of surface would create a clear reflection?

Answer 8

A smooth surface

Question 9

What happens to light waves when they enter a denser medium?

Answer 9

They slow down and bend towards the normal line.

Question 10

Multiple Choice: Which of the following is NOT a primary color of light? A) Red B) Blue C) Green D) Yellow

Answer 10

D) Yellow

Question 11

Fill in the blank: The angle of incidence is equal to the angle of ___.

Answer 11

reflection

Question 12

What is the visible spectrum?

Answer 12

The range of wavelengths of light that can be seen by the human eye.

Question 13

True or False: Light waves can travel through a vacuum.

Answer 13

True

Question 14

What is a prism used for?

Answer 14

To refract and disperse light into its component colors.

Question 15

Multiple Choice: Which color has the longest wavelength? A) Red B) Blue C) Green D) Violet

Answer 15

A) Red

Question 16

What type of waves are light waves?

Answer 16

Electromagnetic waves

Question 17

True or False: Dark surfaces absorb more light than light surfaces.

Answer 17

True

Question 18

What is the main factor that determines the color we perceive an object to be?

Answer 18

The wavelengths of light it reflects.

Question 19

Fill in the blank: The bending of light rays around an object is known as ___.

Answer 19

diffraction

Question 20

True or False: The color white is produced by the absorption of all colors of light.

Answer 20

False

Question 21

What forms shadows?

Answer 21

Shadows are formed when light is blocked from an object.

Question 22

Define transparent materials.

Answer 22

Transparent materials allow almost all light to pass through.

Question 23

What does it mean if a material is opaque?

Answer 23

Opaque materials do not allow any light to pass through.

Question 24

What is a luminous object?

Answer 24

A luminous object is a light source that emits its own light.

Question 25

What is illumination?

Answer 25

Illumination refers to being lit up by light.

Question 26

Define refraction.

Answer 26

Refraction is when a wave changes direction as it moves from one medium to another.

Question 27

What happens to light rays when they enter a dense substance?

Answer 27

They are refracted towards the normal.

Question 28

What happens to light rays when they move to a lower density medium?

Answer 28

They are refracted away from the normal.

Question 29

Define reflection.

Answer 29

Reflection is the change in direction of a wave when it comes into contact with a change of medium.

Question 30

What is the law of reflection?

Answer 30

The angle of incidence is equal to the angle of reflection.

Question 31

What is dispersion?

Answer 31

Dispersion is the separation of white light into colors according to wavelength.

Question 32

What are the scientific primary colors?

Answer 32

* Red * Green * Blue

Question 33

What are secondary colors and how are they formed?

Answer 33

* Yellow (Red + Green) * Magenta (Red + Blue) * Cyan (Green + Blue)

Question 34

How do we see color?

Answer 34

The color an object appears depends on the colors of light it reflects.

Question 35

What does it mean if an object appears black?

Answer 35

It means that all colors are absorbed and no light is reflected.

Question 36

Define a wave.

Answer 36

A wave is a disturbance that travels through a medium from one place to another, transferring energy.

Question 37

What is a medium in the context of waves?

Answer 37

A medium is a substance that carries the wave (solid, liquid, gas).

Question 38

Describe longitudinal waves.

Answer 38

In longitudinal waves, the vibrations of particles are parallel to the direction of wave travel.

Question 39

Describe transverse waves.

Answer 39

In transverse waves, the vibrations of particles are at right angles to the direction of wave travel.