Date: Tue, 27 Apr 2010 20:10:21

Author: Paul Lulai

Subject: Re: Smaller Spacings for Double Slit Samples

Post:

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another list mentioned using hair. then the lab becomes finding the =
width of hair, not a comparison of knowns. i am intrigued. any issues =
with this approach?
=20
Paul Lulai
Physics Teacher
Medtronic - St Anthony RoboHuskie 2574
3303 33rd Ave NE
St. Anthony Village Senior High
Saint Anthony Village, MN 55418
=20
(w) 612-706-1146
(c) 612-208-PHYZ (or 7499)
(fax) 612-706-1020
plulai@stanthony.k12.mn.us
http://www.stanthony.k12.mn.us/hsscience/ =
=20
=20

________________________________

From: tap-l-owner@lists.ncsu.edu on behalf of Sam Sampere
Sent: Tue 4/27/2010 7:53 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Smaller Spacings for Double Slit Samples


I use the Pasco slit set for an interference/diffraction lab I wrote =
years ago. Use the Pasco multiple slit set. There are four sets of slits =
to use. I keep slit width the same and vary the distance between them. =
There are four double slits you can match up that way.
=20
1) there is a multiple slit option (width and separation constant) with =
n=3D2, 3, 4, 5(?). Use n=3D2.
2) on the variable double slit (width =3D constant, separation smoothly =
varies), use the widest separation.=20
3) There are 4 sets of double slits which change the 2 parameters. One =
of these matches the width from 1 and 2.
4) Sorry, I don't remember the 4th, but you can easily find it. Let me =
know if you want it and I'll send that detail.
=20
Have the students mark lines on the minima. Finding the spacing between =
adjacent maxima is now easy, especially if you mark off say 10 (n) o =
minima. Measure the distance between the furthest mins (in mm) and =
divide that by n-1(the number of bright fringes).=20
=20
They can measure L, the distance from the slit to the screen. A plot of =
a/L vs.d gives you lamba for the slope. The plots are typically very =
very very linear and they come up with lambdas very close to nominal, =
within 5%.
=20
Use this lamba to determine slit width for single slit diffraction =
patterns and you get very good values for width, too.=20
=20
I think interference and diffraction are one of the coolest labs of the =
2nd semester.
=20
Sam
=20
________________________________

From: tap-l-owner@lists.ncsu.edu [tap-l-owner@lists.ncsu.edu] On Behalf =
Of Bill Norwood [bnorwood@umd.edu]
Sent: Tuesday, April 27, 2010 4:59 PM
To: tap-l@lists.ncsu.edu
Subject: [tap-l] Smaller Spacings for Double Slit Samples



Hi Taplers,

=20

In one of our labs they are needing double slits with known spacings,=20

in the range of about 0.1mm to 0.2mm.=20

The only usable double slit on the PASCO plates=20

is the double slit on the multiple slits slide, at 0.125mm spacing.=20

=20

(Sorry, but I don't know why they are specifying this,=20

but the TAs and instructor were in agreement about it.)

=20

Any ideas?

=20

Many thanks,

Bill Norwood, U of MD at College Park

=20

=20


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From tap-l-owner@lists.ncsu.edu Tue Apr 27 21:21:42 2010

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