Using Wein's Law

(Wien's law: )

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Aliya Habib 1L
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Joined: Fri Sep 25, 2015 3:00 am

Using Wein's Law

Postby Aliya Habib 1L » Fri Oct 02, 2015 10:51 am

Q: The temperature of molten iron can be estimated by using Wien's Law. If the melting point of iron is 1540 degrees Celsius, what will be the wavelength corresponding to the maximum intensity when a piece of iron melts?

So the textbook defines Wein's Law as , where c = 5.67 x 10^-8 W.m^-2.k^-4

I thought I could solve for by isolating it in this equation as so

When I plug in the values I get an incorrect answer. I am wondering what information I am lacking in solving this problem.

Thanks in advance Chemistry Community !

Kevin Neumann 1A
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Re: Using Wein's Law

Postby Kevin Neumann 1A » Fri Oct 02, 2015 2:20 pm

I'm not sure which values you used to plug in, but maybe you didn't convert from Celsius to Kelvins before plugging in numbers. 1540 degrees Celsius = 1813.15 degrees.

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Re: Using Wein's Law

Postby Chem_Mod » Fri Oct 02, 2015 10:47 pm

You should be using absolute temperature (Kelvins) when using Wein's law. This is also true for many equations, some of which you will find in 14B, since temperature in Kelvins only has positive values.

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