Physics 1.1 (Properties of Light) Flashcards
1
Q
What phenomenon allows us to see objects that do not produce their own light?
A
The light reflected from the object enters our eyes
2
Q
Light can travel through which medium?
A
solid
liquid
gases
empty space
3
Q
Umbra happens when?
A
the light source is small
4
Q
Penumbra happens when?
A
the light source is large
5
Q
The shadow difference of umbra and penumbra.
A
The edges of the shadow of the umbra are sharp while penumbra’s appears blurred.
6
Q
What would happen to an image in a pinhole camera if the object is placed further from the pinhole camera?
A
The image will become dimmer and smaller
7
Q
What is the speed of light?
A
1080000000km/h
300000000m/s
(300000km every second)
(Around the Earth’s equator 7.5 times in 1 second)
8
Q
One light year is approximately to how many km?
A
10 000 000 000 000 km
