15Apr/103
What is the difference between a hot black body and a cool black body?
A. The hot black body radiates less intensely at shorter wavelengths but more intensely at longer wavelengths.
B. The hot black body has a larger mass.
C. The hot black body radiates more intensely at all wavelengths.
D. The hot black body has a larger radius
E. The hot black body radiates more intensely at shorter wavelengths but less intensely at longer wavelengths.
I guess E but I think I'm wrong. Which one is the correct answer?
April 15th, 2010 - 20:11
c
April 15th, 2010 - 20:21
The hot black body has absorbed more heat than the cold black body.
April 15th, 2010 - 21:16
I agree with C. Here’s why. Let’s say the cold black body is only warm enough to make infrared. Let’s say it’s glowing with 100 watts of infrared. Now, let’s say you heat it up. One, it will glow visible light (shorter wavelenghts). Two, in infrared it will be even brighter (like 200 watts).