# User:Steven J. Koch/080328 Physics 102 Soap Bubble Homework

(Difference between revisions)
 Revision as of 13:30, 29 March 2009 (view source)← Previous diff Current revision (15:10, 26 October 2012) (view source) (→Homework) Line 8: Line 8: ==Homework== ==Homework== - Please turn these answers in via WebCT or facebook by 11:00 am Tuesday March 31. + Please turn these answers in via WebCT or facebook by 11:00 am Tuesday October 30. #Try to repeat this experiment!!!  If you are able, upload a photo or video to facebook or WebCT with your assignment.  Alternatively, see if you can find other interference patterns like this around your home or apartment and submit either a photo or description.  If you want to do the coffee cup experiment, I will give some hints below. #Try to repeat this experiment!!!  If you are able, upload a photo or video to facebook or WebCT with your assignment.  Alternatively, see if you can find other interference patterns like this around your home or apartment and submit either a photo or description.  If you want to do the coffee cup experiment, I will give some hints below.

## Introduction

Picture of my coffee mug experiment. See video on youtube

I performed the experiment on page 570 of the book (Conceptual Physics, 10th edition, Paul Hewitt). To the right is a picture of a soap bubble made on the mouth of a black coffee cup, illuminated by sunlight through my window, about 5 pm Wednesday Oct. 18 2006. (You can also watch the video on youtube.) Though the perspective is a little confusing, I am holding the cup so that gravity points to the right (and into the page), so the film is thinnest on the left, and thickest on the right.

Part of coffee mug picture compared with simulation used on wikipedia. Look how close the simulation is to the real image!

Below that image on the right is a magnification of the center of the above image, compared with a simulation from wikimedia. From the left, I see: Black, blue, white, yellow, red, (black?), blue, cyan, (white?), yellow, magenta, purple, blue, cyan, green, magenta, blue, green, magenta, green, white? The simulation is pretty close, huh? Amazing physics!