Making rainbows And Colors Of Light

Question 1

What did Isaac Newton discover about light in 1666?

Answer 1

Newton showed that white light could be split into different colours.

Question 2

What is the range of colours that can be seen in white light called?

Answer 2

The range of colours is called a spectrum.

Question 3

How many colours are commonly agreed to be in the spectrum?

Answer 3

Most people now agree that there are seven colours.

Question 4

What is the order of the seven colours in the spectrum?

Answer 4

The order is red, orange, yellow, green, blue, indigo, violet.

Question 5

What mnemonic can be used to remember the order of the colours?

Answer 5

You can remember the order using the name ‘ROY G. BIV’.

Question 6

What does dispersion mean in the context of light?

Answer 6

Dispersion means splitting light into different colours.

Question 7

What causes dispersion of light?

Answer 7

Dispersion happens because light is refracted.

Question 8

What shape is a prism that is used to demonstrate dispersion?

Answer 8

A prism is in the shape of a triangle.

Question 9

Which colour of light is refracted through the largest angle?

Answer 9

Violet light is refracted through the largest angle.

Question 10

Which colour of light is refracted through the smallest angle?

Answer 10

Red light is refracted through the smallest angle.

Question 11

What is a rainbow?

Answer 11

A rainbow is formed when drops of water in the air cause dispersion of light and reflect light from inside the drops.

Question 12

What conditions are necessary to see a rainbow?

Answer 12

1. The Sun must be shining to provide bright light.
2. There must be rain or small drops of water in the air.
3. The Sun must be behind you.

Question 13

What name is given to white light being split into different colours?

Answer 13

Dispersion

Question 14

What name describes the piece of equipment used to separate white light in the diagram?

Answer 14

C triangular glass prism

Question 15

What shows the position of red light on the screen?

Answer 15

The letter indicating red light’s position on the screen.

Question 16

Which colour of light is refracted through the smallest angle?

Answer 16

The colour that is refracted through the smallest angle.

Question 17

What word describes the range of colours seen on the screen?

Answer 17

Spectrum

Question 18

Why are drops of water needed for a rainbow to be seen?

Answer 18

Drops of water refract light to create a rainbow.

Question 19

How many colours do some people see in a rainbow if they see indigo and violet as the same colour?

Answer 19

They will say they can see 6 colours in the rainbow.

Question 20

What are the primary colours of light?

Answer 20

The primary colours of light are red, green, and blue.

Question 21

How do primary colours of light differ from primary colours in paints?

Answer 21

The primary colours of light mix differently from the colours in paint.

Question 22

What colour is formed by adding red and green light?

Answer 22

Red + green = yellow.

Question 23

What colour is formed by adding red and blue light?

Answer 23

Red + blue = magenta.

Question 24

What colour is formed by adding blue and green light?

Answer 24

Blue + green = cyan.

Question 25

What colour is formed by adding all three primary colours of light?

Answer 25

Red + green + blue = white.

Question 26

How are colours produced on screens like mobile phones and televisions?

Answer 26

Colours are produced from combinations of the three primary colours of light.

Question 27

What can be seen when looking closely at a computer monitor or television screen?

Answer 27

You can see the individual sources of red, green, and blue light.

Question 28

What colors can most screens display?

Answer 28

Most screens can display 256 different colors.

Question 29

How is the color orange created on a screen?

Answer 29

Orange is made by adding red and green, with the red brighter than the green.

Question 30

What is the purpose of a filter in chemistry?

Answer 30

Filters are used to remove something from a mixture.

Question 31

How do colored filters work with light?

Answer 31

Colored filters remove colors from light by only transmitting light of their color and absorbing all others.

Question 32

What is a common example of colored filters?

Answer 32

Traffic lights use colored filters to display red, yellow, or green.

Question 33

How do traffic lights use colored filters?

Answer 33

Each traffic light has a colored filter in front of a white lamp, transmitting only the color of the filter.

Question 34

What happens when white light passes through a red filter?

Answer 34

Only red light is transmitted; the other six colors are absorbed.

Question 35

What is the process demonstrated by colored filters in traffic lights?

Answer 35

This is an example of subtraction of light, where white light has had six colors subtracted to leave only one color.

Question 36

What type of lamp is used in the blue stage light?

Answer 36

A white lamp is used in the blue stage light.

Question 37

What is the purpose of the blue filter in the stage light?

Answer 37

The blue filter is used to produce blue light.

Question 38

How can photographers create different effects?

Answer 38

Photographers can use coloured filters on a camera.

Question 39

What happens when white light shines on a green filter?

Answer 39

Only green light will get through; the other colours are absorbed.

Question 40

What is the result when green light shines on a red filter?

Answer 40

No light will get through because green is absorbed by the red filter.

Question 41

What can be done with colours of light?

Answer 41

It is possible to subtract colours of light until the end result is zero.

Question 42

What is a non-luminous object?

Answer 42

A non-luminous object is one that does not emit its own light.

Question 43

How do we see colors in non-luminous objects?

Answer 43

We see the light reflected from the object.

Question 44

Why does a flower appear yellow in white light?

Answer 44

The flower reflects only yellow light and absorbs the other six colors in white light.

Question 45

What does a white object do with colors in white light?

Answer 45

A white object reflects all the colors in white light equally.

Question 46

What does a black object do with colors in white light?

Answer 46

A black object absorbs all the colors in white light and does not reflect any.

Question 47

What determines the color appearance of an object?

Answer 47

The color appearance of an object depends on which colors of light it reflects and which it absorbs.

Question 48

What are the three primary colors of light?

Answer 48

The three primary colors of light are red, green, and blue.

Question 49

What color is produced when red light and blue light are added together?

Answer 49

Magenta

Question 50

What color is produced when red light and green light are added together?

Answer 50

Yellow

Question 51

What color is produced when red, green, and blue lights are added together?

Answer 51

White

Question 52

What color of light will be seen when a yellow filter is used with a white lamp?

Answer 52

Yellow

Question 53

What color of light will be seen when an orange filter is used with a white lamp?

Answer 53

Orange

Question 54

A green ball appears green. What two colors of light could be shining on the green ball?

Answer 54

Green and white

Question 55

A blue ball appears black. What two colors of light could be shining on the blue ball?

Answer 55

Red and green

Question 56

A T-shirt looks red. Which of the following could explain this? (Choose three letters) - A: The T-shirt is red and is seen in white light - B: The T-shirt is red and is seen in red light - C: The T-shirt is blue and is seen in green light - D: The T-shirt is white and is seen in red light - E: The T-shirt is yellow and is seen in blue light

Answer 56

A, B, and D

Question 57

Why does a red cube appear black in green light?

Answer 57

Because the red cube absorbs green light and does not reflect any light, making it appear black.

Question 58

Why does a blue cube appear black in red light?

Answer 58

Because the blue cube absorbs red light and does not reflect any light, making it appear black.