the night before AP exam

so, good luck to you all. or, congrats on surviving AP physics. depending on when you're reading this.

doc! and to all readers, there's been good times and bad times. thanks for a great year!


in favor of studying, my last "required" blog will be cut short, i think. i got a few tips on how to do this quickly and effectively.



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So. I was at my desk. Wondering what to write about. And then I remembered something. It was a time when I went through a revolving door. There's me going in like a boss. Force perpendicular to the radius to maximize torque. Like a boss. since torque = r F sin theta, i remembered that sin theta is 1 at 90 degrees.

Then there's Matt Lum. Show him how its done Grozen.


I do so bad on tests man, I remember this time I got like a 70 or something and posted about it on my blog. I might get a C this quarter. I saw kelly and jrad today. they were like, within 800 meters of each other. yup, thats scandalous

things that shine with the colors of a rainbow

Today, I noticed in the shower at some point, that a good number of the bubbles I made were clear and transparent but still shined with colors of a rainbow. It occurred to me that I had no idea why bubbles shine with the colors of a rainbow.

I found out the reason why bubbles shine with colors of the rainbow: the variety of colors was the result of thin-film interference.

When white light hits an object, some of it is reflected back. Thus causing the object to shine with the colors of a rainbow. Consider the following scenario for a bubble which shines with the colors of a rainbow:

When light bounces off the bubble, it undergoes a 180 degree phase change as it moves to a media with a higher index of refraction, a crucial first step in making it shine with the colors of a rainbow.

The rest of the light passes through the bubble and consequently reflects back without phase change at the second interface between air and bubble. This causes the white light waves to travel different lengths toward the same point.

Different things will happen when the light waves coincide. If the waves differ by 180 degrees, they will both shine with the colors of the rainbow. No, not really--no light will appear. If the waves coincide, light appears. Different colors within the visible light spectrum have different wavelengths and are affected differently while passing through a bubble. Wavelength and index of refraction are directly related; hence, when passing through the bubble, only certain colors will appear, thus making the bubble shine with colors of a rainbow.




PS: while looking at bubbles which shine like colors of a rainbow, i did not really fancy the idea of getting my camera wet. so i used someone else's which had a similar effect.

PPS:

@ david: if you don't look at it that way, it's not obscene. jesus.