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I stopped by the thunderdome a few minutes ago to see if I could
find any of you. I have placed your graded HW 4 in my chemistry
mailbox. Feel free to go by and pick it up. (Caroline, I still
have yours in my office since you are coming by tomorrow afternoon
to pick it up.)<br>
<br>
Everybody did well. Only a few things got some of of you. <br>
<br>
1. The "shorthand" version of the expectation value of r for the
hydrogen atom is<br>
<br>
<img style="vertical-align: middle"
src="cid:part1.03050905.02040507@mercer.edu" alt="$\left<
\hat{r} \right> = \frac{n^2 a_0}{Z}\left\{1 + \frac{1}{2}
\left[1 - \frac{\ell \left(\ell +1\right)}{n^2}\right] \right\}$"><br>
<br>
Some of you made mistakes on your plots because you used an
incorrect formula or -- what was more troubling - when you were
asked to compare the results of that with the long form involving
integrals you got different results -- but didn't flag that as being
a problem.<br>
<br>
2. Many of you did not record your answers in eV where indicated.
We are going to inundated with different energy units over the next
five weeks -- make sure you know how convert to and from the energy
units requested.<br>
<br>
3. Units are your friend -- and help me assure that you got the
answer right. Please record them when appropriate.<br>
<br>
4. Probabilities are between 0 and 1. If you get something outside
of this range when you are asked to report a probability you have
made a mistake.<br>
<br>
<br>
<br>
<br>
<pre class="moz-signature" cols="72">--
Andrew J. Pounds, Ph.D. (<a class="moz-txt-link-abbreviated" href="mailto:pounds_aj@mercer.edu">pounds_aj@mercer.edu</a>)
Professor of Chemistry and Computer Science
Mercer University, Macon, GA 31207 (478) 301-5627
<a class="moz-txt-link-freetext" href="http://faculty.mercer.edu/pounds_aj">http://faculty.mercer.edu/pounds_aj</a>
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