11/03/08

Hey guys, it’s been awhile. (:

During this period we worked on two sheets, "appendix 2.4: Chart for evaluating the models of light" and "contributions to the determination of the speed of light". Unfortunately, because of the Boo@DMCI pep-rally last Friday, we are a class behind. Either way, we are encouraged to work harder! ;D

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Answers for Appendix 2.4: Chart for evaluating the models of light:
Phenomena: Rectilinear Propagation
Supporting arguments:
~Sunlight passes through clouds making straight lines.
~Sharp objects are cast
Counter-Arguments:
~None.

Phenomena:Reflection
Supporting arguments:
~very hard spheres collide with very hard surfaces and bounce off the same angle.
Counter-Arguments:
~none.

Phenomena:Refraction
Supporting arguments:
~When a ball rolls down a slip and continues on to a lower slope, the accelerating force causes the ball to change direction; resulting in a refraction.
Counter-Arguments:
~Speed of light in H2O is less than the speed of light in air.

Phenomena:Dispersion
Supporting arguments:
~each particle of a spectrum has a different mass. Violet refracted more than blue, so violet has small mass.
Counter-Arguments:
~All particles have the same mass.

Phenomena:Diffraction
Supporting arguments:
~Newton felt that the beam bending outward form a slit resulted from the interactions and collision between the light particles at the edge of the slits.
Counter-Arguments:
~Grnaldi showed that a beam of light passing through a successive narrow slits produced on a screen, a band of light slightly larger than the width of the slits.

Phenomena:Partial reflection/refraction
Supporting arguments:
~Newton proposed the “theory of fits”. “Fit” for easy reflection
Counter-Arguments:
~How does a particle know about what is good “fit”?

Phenomena:Speed of light
Supporting arguments:
~Light moves quickly in a dense medium.
Counter-Arguments:
~The opposite is true, light moves slower in a dense medium.

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As for the other sheet, Im not done that yet. you’re on your own, sorry!
Ohh our labs for “Newton’s particle model for the refraction of light” was due today too, and we got to know our term marks. So for those who weren't here his period, you didn’t miss out on much.
~mary lam

Next scribe is tan00!