GREPhysics.NET: GR0177 #63

GR0177 #63

Problem

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Statistical Mechanics $\Rightarrow$ }Wien Law

Recall Wien's Law, $\lambda T = 2.9 E-3$ . It relates the temperature with the wavelength at maximal intensity. The wavelength at the maximal intensity is approximately $2\mu m$ . Plugging this in, one finds that $T = 2.9E-3/2E-6 \approx 1500K$ , as in choice (D).

Alternate Solutions

UNKNOWNUMBER 2018-10-19 02:26:37	Just approximate the constant as 3. Knowing Wien\'s law, you get 3/2=1.5. The answer has to be VERY close to that number times some power of 10, so you can quickly zone in on (D). Reply to this comment
Ning Bao 2008-02-01 07:16:07	Dimensional analysis: you get m*K and K and m and are asked to solve for K. Reply to this comment

Comments

UNKNOWNUMBER 2018-10-19 02:26:37	Just approximate the constant as 3. Knowing Wien\'s law, you get 3/2=1.5. The answer has to be VERY close to that number times some power of 10, so you can quickly zone in on (D). Reply to this comment
Ning Bao 2008-02-01 07:16:07	Dimensional analysis: you get m*K and K and m and are asked to solve for K. Reply to this comment

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