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oxiswoofer
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Forum Posts: 2101
Member Since:
April 1, 2003
April 1, 2003
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tjoff...sitter med en ny fysikuppgift här..:
"Wolframglödtråden i en 60-watts lampa har arean 0.85 cm^2. Dess emittans är 35% av emittansen hos en absolut svart kropp. beräkna glödtrådens temperatur."
jag har tillgång till fomrlerna:
P = sigma*arean*(T^4)
T= (P/A*sigma)^(1/4)
men det fungerar inte..får ut fel svar..svaret skall vara 2400 Kelvin
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