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fysikuppgift igen
oxiswoofer
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February 22, 2004 - 6:29 pm
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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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Ogrebeast
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February 22, 2004 - 6:37 pm
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Funkar för mig. Jag får T = 2442 K.

Använder du Sigma(svartkropp) = 5.6705*10^(-8) ?

oxiswoofer
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February 22, 2004 - 6:39 pm
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Ogrebeast wrote: Funkar för mig. Jag får T = 2442 K.

Använder du Sigma(svartkropp) = 5.6705*10^(-8) ?

jao använder den konstanten...

så du använde den formeln? T= (P/A*sigma)^(1/4) ?
med värdena :
P=60
A= 0.0085
? 😮

edit: jag får t = 593 hela tiden..

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Ogrebeast
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February 22, 2004 - 6:43 pm
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oxiswoofer wrote: A= 0.0085

Gör om gör rätt. wink

oxiswoofer
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February 22, 2004 - 6:51 pm
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hm...
okej...A = 0.000085? men jag får ändå fel svar...
och A= 0.00085 blir åsså fel svar..
samma sak med 0.0000085.....

fan nånstans gör jag fel..

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Ogrebeast
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February 22, 2004 - 6:55 pm
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T= (60/(8.5E-5*0.35*5.6705E-8))^(1/4)

CoLiC
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February 22, 2004 - 6:58 pm
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Ogrebeast wrote: T= (60/(8.5E-5*0.35*5.6705E-8))^(1/4)

...

oxiswoofer
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February 22, 2004 - 6:58 pm
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ahhhhhhhhhhhhh....fan vad dum jag e ...glömde gångra med 0.35...

tack så mkt, du e min räddare i nöden 😀

Smirnoff
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February 22, 2004 - 7:22 pm
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T = 2442 K.

Mäts det hela i Kevlin?

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Ogrebeast
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February 22, 2004 - 7:39 pm
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Smirnoff wrote: T = 2442 K.

Mäts det hela i Kevlin?

Kelvin ja. Formlerna är anpassade efter den skalan.

Dehman
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February 23, 2004 - 12:00 pm
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Ogrebeast wrote: T= (60/(8.5E-5*0.35*5.6705E-8))^(1/4)

Bra Ogre. 😀

OT. Din sign, jag har inte hört en enda skåning säga konsonanter med det uttalet...

MrWeizel
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February 23, 2004 - 12:28 pm
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Dehman wrote: OT. Din sign, jag har inte hört en enda skåning säga konsonanter med det uttalet...

det har inte jag heller, men har inte haft hjärta nog att plocka ner honom på marken laugh

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Ogrebeast
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February 23, 2004 - 1:20 pm
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Dehman wrote: [quote=Ogrebeast]T= (60/(8.5E-5*0.35*5.6705E-8))^(1/4)

Bra Ogre. 😀

OT. Din sign, jag har inte hört en enda skåning säga konsonanter med det uttalet...

Nä, men jag har inga såna tecken på tangentbordet som beskriver dessa läten. :bgrin:

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