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6B40.10 - Light Bulb and Variac

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​6B40.10 - Light Bulb and Variac

Preview
SelectSelected
Title6B40.10 - Light Bulb and Variac
Objective

Demonstrate color change with temperature.​

StatusAvailable
Assembly Instructions

A 500-W incandescent light bulb is plugged into a variac. Slowly turn up the variac and observe the changing color of the filament.


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Setup Time5
Operation Time5
Preview Time5
Operation Instructions

​ Slowly turn up the variac and observe the changing color of the filament.
DO NOT TOUCH SURFACE OF BULB

ExportableNo
Demo on DimeNo
PIRA 200No
Export Instructions (if different)
 Replace "large light bulb" with "500W filament bulb".  In operation instructions, list the 2nd sentance in the assembly instructions.  Then list what colors corespond to what temparatures (i.e. yellow = 2700K, white = 5000K, etc.).
HazardsNone
Analysis/Information

​Wien's Law describes this effect. Peak wavelength is inveresly proportional to temperature.

Yellow = 2700K

White = 5000K

Category6 Optics
Subcategory6B - Photometry
Keywordsblackbody radiation, black body
Construction Information
 
Equipment TitleUse SHIFT+ENTER to open the menu (new window).
  
QuantityUse SHIFT+ENTER to open the menu (new window).
  
variac
1
light bulb - 500W, 115V, filament
1
Do Not Touch Bulb sign
1