This week's questions are straightforward (I hope) applications of Wien's law and the blackbody laws in general (sections 5-3 and 5-4) and Kirchhoff's laws (section 5-6)

1. The temperature at the sun's surface is 5800 K.  What does Wien's law predict for the color of the sun? 
You can divide the 400-nm to 700-nm visible spectrum into 6 colors sort of equally or use the diagram below

2. The universe is bathed in blackbody radiation; the accidental discovery of this radiation in 1965 won 2 Bell Labs people a Nobel prize. Click here to see the blackbody spectrum of the universe.

From the spectrum, use the appropriate law and calculate  the "temperature of the universe"

(I know it will be to somewhat annoying to type formulas into boxes below, especially those with greek letters, so simplify and abbreviate as much as possible. In simple formulas, you could just name the law you're using  OR write out the formula OR  refer to an equation number in the book... in addition to telling me what numerical values you substituted for the knowns; don't bother to show intermediate calculational steps, please.)

3.   Why is it bothersome that the universe has a blackbody spectrum?
 

I did my own work on this JIT (in other words i consulted NO other person)

Click on the      button to send the results to Kolena or click     to start over.