Light - Physics Flashcards
1
Q
Energy
A
Energy is the ability to do work. Unit of energy is the joule
2
Q
Plants use of light
A
Photosynthis
3
Q
Humans use of light
A
Solar power and crookes radiometer
4
Q
Luminous
A
Objects that give off light eg. A lightbulb, the sun
5
Q
Non-luminous
A
Objects that do not give off light eg. A book, a table
6
Q
Speed of light
A
3 x 10(8) m/s OR 300000000 m/s
7
Q
Speed of sound in air
A
340 m/s
8
Q
Light travels in straight lines, we can show this by
A
Blocking light from a bulb with cardboard
9
Q
Light does not travel around corners, we can show this by
A
Blocking light leads to shadows
10
Q
Solar eclipse
A
When the moon blocks the sun while passing over the earth
11
Q
Lunar eclipse
A
When the earth is between the sun and the moon, and the moon is in the earths shadow
12
Q
Light
A
Iight is a from of energy
