What sense do we use in this kind of energy?
SIGHT (Eyes)
What sense do we use in this kind of energy?
TOUCH (Skin)
What sense do we use in this kind of energy?
HEARING (Ear)
What organs do we use in this kind of energy?
EYES (Sight)
What organ do we use in this kind of energy?
SKIN (Touch)
What organs do we use in this kind of energy?
EARS (Hearing)
How does sound travel?
When an object vibrates, it produces sound waves
Loud sounds are...
...LARGE VIBRATIONS
Quiet sounds are...
...SMALL VIBRATIONS
Sound travels through a...
Medium (solid, liquid or gas)
In what medium sound moves faster?
Sound moves four times faster THROUGH WATER than through the air
What is LIGHT?
It is a form of energy on the electromagnetic spectrum
What are the main light sources?
ARTIFICIAL and NATURAL light source
How does light travel?
In curves
By plane
It does not travel
In a straight line
Say two properties of artificial light sources:
Man-made and light energy is transformed from another energy source
