What is light?

Question 1

What are some sources of light?

Answer 1

fire, light bulb, the sun.

Question 2

What is light?

Answer 2

A type of energy. Light sources change a different type of energy into light energy - heat and light.
Light is a a wave that is emitted from a light source.

Question 3

What is light a form of?

Answer 3

light is a form of energy - electromagnetic radiation. It occurs as waves.

Question 4

How does light travel?

Answer 4

In straight lines.

Question 5

What is a vacuum?

Answer 5

empty space.

Question 6

Can light travel through a vacuum?

Answer 6

Yes.

Question 7

How fast does light travel?

Answer 7

Light travels at 300 000 000 m s-1 (in a vacuum)

Question 8

What are the components of visible light?

Answer 8

ROYGBIV - Rainbow colours. Red has the longest wavelength, and violet has the shortest wavelength.

Question 9

How do you calculate the speed of light?

Answer 9

Time taken (s) = 
Distance (km) divided by Speed of light (km s-1)

Question 10

Light occurs in waves, such as:

Answer 10

visible light, invisible light (infrared and ultraviolet), X-rays, microwaves, and radio waves.