Monday, November 1, 2010

Light Review/Chalk experiment

Today in class, we started by checking our homework from last Friday and from the weekend. We were suppose to play a review game using the questions we came up with, but many of the questions where not what the teacher was expecting.

Than we decided to go over the discovery of Newton.

The question based on Newton were:
What happens when white light goes through a prism?

People answered that white light would spread in the prism as it bends and since white light is made up of many colors, when it slows down in the prism, many colors appear.

We discussed about how the different colors have different speed and bend more or less

Than we discussed why this doesn't happen with laser
We thought that this happens because the light of the laser is not white but red.

Next we thought about why do we see the object's color? (why is the sweater orange and why is that sweater blue?)
Light hits the object and goes into your eye,
when the white light hits the orange sweater, only the orange light bounces off and other colors get absorbed
We thought about the time we were observing the laser and thought about how when the laser is shined at a black poster, the laser becomes less visible than when we shine it on an orange poster.

We could test the absorption by placing a black colored paper and a white color paper under a glass of water and see what the temperature of the water is.

Than we asked our selves, where do we see the prism effect in real life?
After rain we would see a rainbow we would see the prism and white light effect. This happens because the sun acts as the white light and the moisture in the air would act like a prism and bends the white light

What are the other types of energy?
white light
UV rays

Towards the end of class, we placed a piece of chalk under a dictionary and we thought about what would we have to do in order to smash the piece of chalk using the dictionary.

We said that if we drop a book from a distance, the chalk would break. The dictionary would be more able to smash the chalk when it is farther away from the chalk. One student stood on a chair and dropped the book and the chalk did smash

by AT

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