Quiz # 21_2

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Quiz # 21_2

Post  supr mo on Sat Mar 14, 2009 8:50 am

#1
My # 37.35% Then...
100-37.35=62.65=0.6265
0.6265*(cos45)^2=0.31325*100=31.325%
answer positive
working on the rest...

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Q2

Post  guest768 on Sat Mar 14, 2009 1:57 pm

For number two, just do cos(theta)^2
answer is negative

guest768
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3 and 4

Post  krolik on Sat Mar 14, 2009 3:50 pm

Number 3
The distance between the third order 2-slit interference maxima on a screen 1.0928 meter from the slits which are 0.1097 mm apart is 3.48 cm. What is the wavelength of the light in nm (see sheet 20',21) ? Indicate with a positive (negative sign) whether you can (cannot) use the small angle approximation (see sheet 23) for the required accuracy of 1% in the quiz.

3.48E-2 / 2 = .0174
tan-1 (.0174/1.0928) = .912209303
(sin (.912209303) * .1097E-3) / 3 = 582nm

answer is positive


Number 4
In single slit diffraction the slit width is 0.1218 mm and the wavelength is 636 nm. Under which angle (in degrees) does the second order diffraction minimum occur (see sheet 25) ? Indicate with a positive (negative sign) whether at 00 a minimum (maximum) occurs.

(636E-9 * 2) / .1218E-3 = .010443349
sin-1 (.010443349) = .59837

answer is negative

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NUMBER 2

Post  R on Sun Mar 15, 2009 3:03 am

For number 2, simply doing cos (theta)^2 does not work, why not?

R
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QUESTION 2

Post  PHY on Sun Mar 15, 2009 8:35 am

ITS (COS^2) THETA FOR QUESTION 2

PHY
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number 2

Post  me on Sun Mar 15, 2009 1:43 pm

#2 still wont work for me..

i did cos(62.16)^2 = .218
and then i did (cos(62.16))^2 = .218
and i even did cos (62.16^2) = .1068
and i tried them all as negative but i keep getting it wrong. im not getting the calculator syntax right

me
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I need help

Post  cutiepie on Sun Mar 15, 2009 3:01 pm

I need help with 1 & 2

cutiepie
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#3 & #4

Post  k8 on Sun Mar 15, 2009 3:03 pm

Even when I plug in the given values previously posted on the forum for 3 and 4, my numbers punched out in the calculator are so much larger. Like 25 instead of .xxxx. Am I using the wrong mode or something? Is there a setting i need to change to do these problems? I put it on degrees and then radians and still didnt get the correct answer.

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#2

Post  guest_01 on Sun Mar 15, 2009 3:03 pm

for #2..you do cos(theta)^2 x 100..thats ur ans (negative)

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Re: Quiz # 21_2

Post  the dude on Sun Mar 15, 2009 10:29 pm

how did you know to use 45 degrees for theta in the first question? thanks...

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question 3, i cant get it right

Post  Guest786 on Mon Mar 16, 2009 12:21 am

How do you do number 3 i tried doing the equation above and nothing....i even multiplied my answer by 10^-9

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Question3

Post  Guest786 on Mon Mar 16, 2009 12:26 am

never mind i figured it out

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Re: Quiz # 21_2

Post  guest21 on Mon Mar 16, 2009 12:54 am

How do you do it

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Re: Quiz # 21_2

Post  guest21 on Mon Mar 16, 2009 12:55 am

Nevermind I got it to

guest21
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number 2

Post  yourmom on Mon Mar 16, 2009 3:39 am

The solution posted above is wrong, the conversion from mm to m is incorrect. It should be E-4 not E-3

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i meant number 3

Post  yourmom on Mon Mar 16, 2009 3:44 am

**number 3

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Re: Quiz # 21_2

Post  krolik on Mon Mar 16, 2009 11:46 am

it's not wrong, it's a typo. Use the numbers in the problem.

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#2 FOR YOU!!!

Post  #2 FINAL on Mon Mar 16, 2009 12:32 pm

cos(theta), square your answer, multiply by 100, negative!!!

#2 FINAL
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Problem #3

Post  123 on Mon Mar 16, 2009 1:57 pm

can someone please help with number 3 i cant seem to get it

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Re: Quiz # 21_2

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