MadSci Network: Physics
Query:

Subject: How does the filament dimensions of a black light affect its working?

Date: Wed May 10 14:44:00 2000
Posted by Andy N.
Grade level: 10-12 School: Irvine High School
City: Irvine State/Province: CA Country: USA
Area of science: Physics
ID: 957984240.Ph
Message:

Our physics class broke open a black light and a normal frosted lightbulb.
We noticed that the black light filament was both longer and thinner and 
more tightly coiled than the normal bulb's filament. We were wondering if 
these differences in the dimensions of the black light's filament have 
anything to do with the bulb's ability to generate UV light. We would also 
like to know if this ability has anything to do with the resistance of the 
filament increasing with its longer length, and smaller cross-sectional 
area.


Re: How does the filament dimensions of a black light affect its working?

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