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Light and Sound

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Alice Zeng

on 20 December 2014

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Transcript of Light and Sound

Types of Light
There are two types of light, artificial light and natural light. Artificial light is a light that is not made naturally. Some examples of artificial lights are, laser lights and lightbulbs. Natural lights are lights that come naturally. Some examples are, the Aurora Borealis and the sun.
Refraction is light bending when it's passing through a transparent object and another. An experiment you can try to see refraction is to fill a transparent cup full of water. Find a pencil and dip it into the water. You will see that the pencil looks like it's bent and broken.
Light can bounce off of things, such as a mirror. It can also bend or it can be absorbed when it hits dark colors. Sound can also be absorbed by pillows, sponges and sound proofing. When light hits a mirror it bounces off. If the mirror or glass is curved or bent, the light going through it will be curved or bent as well. This is called refraction. Refraction means to break up. Light always travels in a straight line unless it's bent or curved.
Concave and Convex
Concave is when the mirror or glass is curved inwards, like an hourglass. It makes things look smaller and farther away. Convex is when the mirror or glass look like two brackets. It looks larger and closer.
What is sound?
Sound is basically tiny vibrations in the air. Sound travels 8 times faster through metal and brick. This happens because when sound waves squeeze air molecules together, the molecules can pass the message faster.
Ranges and Sound Frequencies
There are three ranges of sound. Mid range, high and low. There are two types of frequencies, high frequencies and low frequencies. Some high frequency sounds are, fire drills, ambulance and police sirens, phones ringing and birds. Some low frequency sounds are, when a car breaks down, the double bass and thunder.
The Ear
The sound waves go into the ear canal and hits the eardrum. It then goes into the hammer, stirrup, the anvil and the cochlea.
Vocal Cords
For females, they have short and thin vocal cords. Boys have long and thick vocal cords
Experiment #1: This is a way of seeing vibrations. Fill a cup with water. Get a tuning fork and hit it against a table. Put the tuning fork in the water. You will see the vibrations because when you hit the tuning fork against the desk, the tuning fork vibrates. If you have a short tuning fork, it will vibrate more. But if you have a long tuning fork, it will vibrate less.

Experiment #2: Poke holes in two transparent cups. Put thread through the holes and tie a knot. Make sure the string is long. Have a friend say something into the cup while you hold it up to your ear. You can hear what your friend said before the other ear.
Here is an experiment you can try to see that light travels in a straight line. First, poke holes in a few small sheets of paper. Then, ask friends to hold the pieces of paper together so that the holes line up together. Shine a flashlight through the holes and then you will be able to see the light shining on the wall.
Incandescense and Bioilluminescence
Incandescence is a material so hot that it glows on it's own. Bioilluminescence is light that is inside of a living thing. An example of incandescence is a sword. When your making the sword, sparks fly out of it because it's so hot. An example of bioilluminescence is a jellyfish.


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