The PHY 124 Fall 2010 Lab 9 pretest is now posted for you to work on and submit before the beginning of your Lab 9 section next week. You will find it in the Assignments content area in Blackboard for your PHY 124 Lab section. As explained in the course syllabus, each Lab pretest is worth 35 points. As you will see, the Lab 9 pretest consists of 3 questions. The first is worth 5 points, the second is worth 12 points, and the third is worth 18 points, making the total possible score 35 points. To do the pretest you will need to study carefully the Lab 9 manual and to re-familiarize yourself with MapleTA syntax. Go to
http://www.ic.sunysb.edu/class/phy122ps/labs/dokuwiki/doku.php?id=phy124off:phy124_main_page
and read the instructions there on the "main page". Please also click on and review the
-- "Instructions" link (you've seen this before)
-- "Uncertainty, Error and Graphs" link (and make sure you read the 17 Nov. 2010 message on this blog about printing out this document)
and, finally, the
-- "PHY 124 Lab 9 - "Atomic Spectra" link.
The "red" links are not yet active, on purpose, but as the course develops they will be made active.
As you already know, the lab pretests are prepared in the "Maple TA" software environment. You may work on each assignment as many times as you wish, but the link in the Assignments section of Blackboard for your PHY 124 section will become inactive at the starting time of your lab section. Therefore, you should not wait until just before your lab section to begin work on it. If you read the Lab Manual carefully and, there is no reason for you not to earn all 35 points for the pretest. Make sure you read carefully the instructions for each pretest problem. After each problem click on "Next" until finishing the last one, Question 4; then make sure you click on "Grade" in the Maple TA software environment. After you get your grade, you may click on "View Details" to see more about how you did. Finally, click on "Quit and Save".
Good luck!
Happy Thanksgiving!
Prof. Koch
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11 comments:
For the first question on Question 2:
2d sin (theta) = m * lambda
solving for d sin (theta)...the answer should be m * lambda divided by 2, but that is marked incorrect.
there is no 2 in the final answer.
for number 1 i dont understand what maple wants us to put in for the unit. i tried grooves/meter but what else can it be? i got the second part right so i know i got the number right
Anonymous at 2:38 pm, One of what you wrote for the units is SI; the other is not. Get rid of the part that is not.
For question 3, where they ask for the units i don't understand why eVs^2/m^3kg i snot accepted
because those are the units that are used in the previous equation.
Anonymous at 12:01 pm: The instructions say "must be in SI units". eV is not an SI unit.
For the last part of number 3, I'm not sure what they're asking for. If n=2, then 1/lambda should equal Rh but that's not what they want. Can anyone help me out?
1/lambda should equal (1/2^2 - 1/n^2), so just solve the equation by plugging in n
Use this formula to calculate a value (must be in SI units) for the the Rydberg constant RH (see Lab 9 manual)
Can someone please help me!
I plugged in 6.626068 × 10-34 m2 kg / s for h and for c i plugged in 3.00e8 m/s. then, I used the formula that I got above 1/(h*c)= 5.03e24
and then converted 13.6 eV into 2.18e-18 Joules, and then got 10966785.53 J/kg *m^3/s^2, but it says i am wrong, so please help me!
never mind! I know what I did wrong, I got the answer!
well i still don't understand number 3's units and i have worked out the same thing as the person above but am still confused any help?
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