Light

Hello

Today was a simple class. We just went over the notes.

First we talked about the wavelengths and frequencies of different types of light.

The types of light on the left side of the electro magnetic spectrum have a high frequency and small wave length. The types of light on the right side have a low frequency and a large wavelength.

As the frequency goes up, the wavelength goes down.

Mr. Lieberman used an example. If you are standing on an overpass looking down at two lanes, one of which has semi trucks in it and the other has sports cars in it, the lane with the sports cars will have a higher frequency because more cars can pass by in a given amount of time. The lane with the semi trucks in it will have a lower frequency because less trucks can pass by in a given amount of time, but will have a higher wavelength.
We then took out our cell phones and looked at the infrared light given off through the remote.

Then we learned about the equation for speed which is, wavelength(frequency)=speed.

We aslo learned about Planck. He stated that the transfer of energy is not continuous. His equation for change in energy is: change in energy=hv

h=Planck's constant= 6.626X10^-34 Js

A higher frequency=more energy

A lower frequency= less energy

Einstein stated that electromagnetic radiation was made up of a stream of particles known as photons.

A man named Louis de Broglie connected the two theories about light (that it was in wavelengths or in streams of particles) to make an equation: wavelength=planks constant/mass(velocity)

The last thing we did was put on 3D glasses and look at the lights on the ceiling. We a continous spectrum of light. After that Mr. Lieberman turned on a helium and mercury light and we saw a line spectrum.

Thats we learned about.

The homework is to do the top of the worksheet we got.

The next scribe is Erika