Light Flashcards
1
Q
Energy
A
Is the ability to do work i.e. move. Unit of energy is the joule.
2
Q
Plants use of light
A
To make food ( photosynthesis )
3
Q
Humans use of light
A
Solar panels and crooke’s radiometer
4
Q
Luminous
A
Objects that give off light e.g. The Sun, lightbulb and lit candle
5
Q
Non-luminous
A
Objects that do not give off light, and need light to bounce off them for us to see them e.g. A book, my face and a table
6
Q
Speed of light
A
3,000,000,000 m/s
7
Q
Speed of sound in air
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
Solar eclipse
A
Occurs when the Moon passes between the Sun and the Earth
10
Q
A lunar eclipse
A
Occurs when the Earth is between the Sun and the Moon, the Moon is in the Earth’s shadow
11
Q
Light
A
Is a form of energy
