Light Flashcards
1
Q
Energy
A
Is the ability to do work. Unit of energy is the joule
2
Q
Plants use of light
A
~ to make food (photosynthesis)
~ photo = light
~ synthesis = to make
3
Q
Humans use of light
A
~ solar panels
~ Crooke’s radiometer
4
Q
Luminous
A
Objects that give off light
5
Q
Non-luminous
A
Objects that do not give off light and need light to bounce off them for us to see them
6
Q
Speed of light
A
300,000,000 m/s
3x10(8) m/s
7
Q
Sped of sound
A
340 m/s
8
Q
Light travels in straight lines
A
We can show this by blocking light from a bulb with card
9
Q
Light does not travel around corners
A
Blocking light leads to shadows
10
Q
Solar eclipse
A
Occurs when the moon passes between the sun and the earth
11
Q
Light
A
Is a form of energy
12
Q
Lunar eclipse
A
Occurs when the earth is between the sun and the moon, the moon is in the earths shadow
