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### Black body for quiz 2

Posted: Sat Oct 14, 2017 11:31 pm
So black body and itâ€™s wiens law are not needed for quiz 2 right?

### Re: Black body for quiz 2

Posted: Sun Oct 15, 2017 12:03 am
Actually test 2 covers Chapter 1 up to the end of section 1.5. Black body and wien's law are in 1.4 so they maybe will appear in test 2

### Re: Black body for quiz 2

Posted: Sun Oct 15, 2017 12:14 pm
I am pretty sure Dr. Lavelle said we would not be covering black bodies, so you will not need to know Wien's law or Stephen Boltzmann law.

### Re: Black body for quiz 2

Posted: Sun Oct 15, 2017 9:50 pm
He did not go over it during lecture very much, so I am sure it is not needed for the test.

### Re: Black body for quiz 2

Posted: Mon Oct 16, 2017 7:09 am
But overall,it's still an important concept.I recommend looking at it even if not tested.

### Re: Black body for quiz 2

Posted: Mon Oct 16, 2017 3:12 pm
I am pretty sure we were told we will not be tested on blackbody radiation, but it is an important concept for understanding the chapter overall.

### Re: Black body for quiz 2

Posted: Mon Oct 16, 2017 6:59 pm
Dr. Lavelle told our lecture that we did not have to worry about black bodies for this upcoming test.

### Re: Black body for quiz 2

Posted: Wed Oct 18, 2017 4:03 pm
I know we don't have to know Wien's law for Test 2, but I had a question regarding significant digits for the textbook's example problem 1.3 displaying Wien's law:

"The maximum intensity of solar radiation occurs at 490. nm. What is the temperature of the surface of the Sun?"

The only value given in this problem is 490. with 3 sig figs. Why then is the answer to this problem 5.9 x 10^3 K with only 2 significant figures?

### Re: Black body for quiz 2

Posted: Thu Oct 19, 2017 3:41 pm
According to what Dr. LaVelle said in class, all we need to know for black body radiation is that atoms and molecules usually only absorb or emit unique frequencies that are allowed by their unique electron structure, but black bodies (hypothetically) absorb or emit all frequencies.

### Re: Black body for quiz 2  [ENDORSED]

Posted: Thu Oct 19, 2017 4:00 pm
kaitlindaugherty3L wrote:According to what Dr. LaVelle said in class, all we need to know for black body radiation is that atoms and molecules usually only absorb or emit unique frequencies that are allowed by their unique electron structure, but black bodies (hypothetically) absorb or emit all frequencies.

Correct and well stated. Introduce yourself at the end of class.

### Re: Black body for quiz 2

Posted: Thu Oct 19, 2017 4:09 pm
Test 2 will only include chapter 1 up until section 1.5 with the exception of calculating black bodies, correct?

3J

### Re: Black body for quiz 2

Posted: Thu Oct 19, 2017 7:47 pm
lnlyzelda_3J wrote:Test 2 will only include chapter 1 up until section 1.5 with the exception of calculating black bodies, correct?

3J

Correct. As I have announced many times in class.