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Light and Sound 
 
 
What are sound waves? 
A wave that propagates sound. 
 
What are light waves? 
Visible light waves are the only electromagnetic waves we can see. We see these waves as the colors of the rainbow. Each color has a different wavelength. Red has the longest wavelength and violet has the shortest wavelength. When all the waves are seen together, they make white light. 
 
How fast do they travel? 
The average speed of sound is said to be approximately 760 miles per hour and light travels 
17,987,547,480 meters per hour. 
 
How do we know they are there and measure them, if we can't see them? 
Can we bend light? 
Yes. If light is going through water for example and then hits air the beam of light refracts or bends in accordance with the new change in speed and direction. 
 
How do we make colours? 
The retina of the human eye has 3 receptors for colors called cones. One of the cone measures red light, another measures green light and the third measures light intensity. This information is further processed by the occipital lobes in our brain, as color by deducing the amount of blue light from the above mentioned 3 factors. 
 
How are we using these waves in our everyday life? 
 
 
How do we hear? 
The human body has several unique processes and hearing is one of them. When a noise is made a vibration or sound wave travels through the air. When this hits the ear it vibrates allowing our brain to interpret that and we hear. 
 
 
How do we see? 
Scientifically, you see through your pupil. The lens covers the pupil, flipping every image we see right-side up. Without the lens, we'd be seeing everything upside down.