How Does Light Travel? Flashcards
1
Q
What are luminous objects?
A
Sources of light
2
Q
What are objects that do not produce their own light?
A
Non-luminous objects
3
Q
When light hits an object it can be….
A
Absorbed , reflected or transmitted
4
Q
If an object is transparent…
A
Most light is transmitted
5
Q
If an object is translucent…
A
Light is scattered
6
Q
If an object is opaque…
A
No light is transmitted so so a shadow is produced
7
Q
Light can…
A
Travel through gasses, some solids and liquids, and completely empty space ( a vacuum)
8
Q
The speed of light in a vacuum is about…
A
300 000 km/s
9
Q
Distances in a space are…
A
Measured in light-time
10
Q
What is light-time?
A
Light-time is a distance not a measure of time.
11
Q
A light-minute is….
A
The distance light travels in one minute.
12
Q
A light-year is…
A
The distance light travels in one year.
