Physics

Many bulbs were broken to find one with a coiled filament. This was then stretched out. ASU copyright Hard to see but the filament is a helix. ASU copyright A laser shines on the helix filament and scatters onto the screen. A marker pen was used to block the center beam to make the diffraction pattern clearer. ASU copyright The diffraction pattern of helix filament. ASU copyright The filament with the laser light on it. ASU copyright	PHYSICS
	7A60.930	Laser Diffraction of a Helix	Rating:
	Captions and Credits to the left in the sidebar.
	Description: The X-ray diffraction pattern of DNA is simulated by the difraction pattern of a laser's light on a coiled filament of a incandescent bulb.
	Room:PS F175	Location: Ga3	Sublocation:
	Type: demo	Date Added:3/27/2007	Condition:
	Quantity:1	Complete:	Last updated: 3/27/2007
	Purpose: To simulate x-ray diffraction of a helix using laser diffraction.
	Safety Issues: Be wary of laser reflections that may hit students. Use shielding as needed. *Disclaimer (Warning - work in progress - may be incomplete)*
	Equipment Issues:
	Parts:
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Accessibility	References:
	Links:http://www2.kenyon.edu/Depts/BioEllipse/courses/biol63/dna-prot/xray.html	Movie:	Caption:

1A0	MEASUREMENT


1A10	Basic Units


1A10.10	Basic units set-Video	Video Encyclopedia: Show a clock with a second sweep, meter & yard sticks, and kilogram and pound mass	VE01_01
			3_1
			PS F175
1A10.35	Meter stick - 4 sided	Graduated in meters, decimeters, centimeters, & millimeters
			Aa2
			PS F175
1A10.50	Liter Cube/set
			Aa2
			PS F175
1A10.510	Meter Cube	Meter cube frame, stored dismantled
			Aa2
			PS F175
1A10.520	Volume Perception Paradox	One liter of colored water is poured from a sphere to cylinder. The sphere seems smaller but is of equal volume.

			PS F175
1A10.60	Avogadro's Number box	Black 22.4 liter cube
			Aa2
			PS F175
1A20	Error and Accuracy


1A20.10	Gaussian curve - Video	Video Encyclopedia: A commercial device for the overhead projector where ball bearings roll through an array of nails into parallel chutes.	VE16_12
			3_1
			PS F175
1A20.25 A	Dice - ordinary
			Aa2
			PS F175
1A20.25 B	Dice - overhead
			Aa2
			PS F175
1A20.25 C	Dice - polyhedral
			Aa2
			PS F175
1A20.25 D	Dice - large foam
			Aa2
			PS F175
1A30	Coordinate System


1A30.10 A	XYZ Coordinate axes	Long arrow shafts with label attachments	top
			7
			PS F175
1A30.10 B	XYZ Coordinate axes	Zometool version
			Aa3
			PS F175
1A30.10 C	XYZ Coordinate axes	Medium arrow shafts with dull broadheads
			cabinet
			PS H356
1A30.30	Polar Coordinates	A semi circle is rotated about an axis to demonstrate why integration over theta is from zero to 180 degrees.
			Aa3
			PS F175
1A30.30	Polar Coordinates


1A30.40 A	Chalkboard Globe - Large
			Af6
			PS H156
1A30.40 B	Chalkboard Globe - Small
			Af6
			PS H156
1A40	Vectors


1A40.001	Vector models, Magnetic Field model, Electric Field model, Electromagnetic Field model	Three cardboard vector models. 1) A uniform vector field represented by 9 arrows in 3 by 3 array. 2)Single vector represent by an arrow perpendicular to cardboard. 3) Same as 2) except a circle is drawn around the arrow to represent the curl of the vector
			Aa3
			PS F175
1A40.10	Vector components (3D)-Video	Video Encyclopedia : Metal arrows define a three dimensional coordinate system. An arbitrary vector is viewed in three planes.	VE01_07
			3_1
			PS F175

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