You are assigned to determine the distance between double...

You are assigned to determine the distance between double slits in lab. You are provided with a 632 nm laser. You are also provided with the following: meterstick, ruler, tape measure, light- intensity meter, large screen, paper, slide holder, stopwatch. The slits are too close together to manually measure the distance. • Identify what lab equipment you would use to determine the spacing of the slits. • Draw a labeled diagram of your lab setup. Make sure all the materials you chose are in the diagram. • Outline the procedure you would use to determine the slit separation. Make sure you use all the equipment you identified and what data you need to gather. • Using the mathematical models we developed in class, show explicitly how you would use your measurements to calculate the slit spacing.

Transcript

00:01 Okay, so this is a big question.

00:03 Okay.

00:06 The basic setup for a double slit experiment is you take your double slit, right, that has some distance d between the slits, and you shine the light on a screen a distance l away.

00:22 And you get spots that show up, right, and the distance between those spots is x of m.

00:30 And the equation that relates all these three is xm, the spacing of the fringes, e -schools m times lambda times l divided by d.

00:42 So i was doing this experiment.

00:44 I've done this experiment with my classes.

00:46 The way i do it is you change the link and you measure how xm changes as a result of that.

00:56 And we use that.

00:57 So basically, we're trying to make a mathematical model, right? in a mathematical model is supposed to look like y equals mx plus b so there's no intercept here right there's no slope so i'll get rid of the b so it's y equals m times x so my y is going to be xm and my x is going to be l that didn't work out there we go just pretend i do the figure rate right the first time and so the slope if you plot xm versus l, your slope will be m lambda over d and you can solve.

01:35 So first, let's start with your question.

01:36 So it says one, determine, let me scroll down, identify what lab equipment you'd use to determine the spacing of the slide.

01:44 So this stuff that you're given, what i would choose to do this, to figure out the distance.

01:50 I need something to measure l, right? so i would use a tape measure because a tape measure can measure longer distances than a meter stick.

02:03 Right.

02:03 So tape measure.

02:05 We're going to need a large screen, something to put over here to shine your pattern onto.

02:15 Obviously the laser, right? we need the laser.

02:20 Ruler, no.

02:22 Well, yeah, a ruler.

02:24 I would use a small ruler to measure xm.

02:30 Paper slide holder.

02:31 We need a slide holder to hold the double slit right and stopwatch that's dumb you want me to stop watch yeah so it should be this stuff okay draw a label diagram of your setup make sure all the materials you chose are in the diagram okay so let me redraw my little picture here okay so we've got our double slit so here's our double slit and then we're going to need something to hold it right so there's my slide holder and then obviously we got the laser right there and the laser's going to shine through and then there's going to be a big screen over here where you're going to get the pattern right and so we're going to use the tape measure, right? that's a decent picture of a tape measure.

03:50 I'm surprised at that.

03:52 So there's my tape measure, and here's my screen, and you can use a ruler to measure to measure how far apart those dots are.

04:14 All the materials you chose are in that line of procedure.

04:17 So i'm going to write what we're going to measure with what.

04:20 So tape measure is going to be to measure l, and a ruler is going to be to measure xm.

04:28 Okay.

04:30 So my procedure number two is basically going to be we need to measure l with a tape measure, and then shine the laser and see diffract.

05:02 Pattern pattern on screen.

05:09 Okay, and then we're going to use ruler to measure distance between two adjacent bright spots.

05:26 We want two bright spots that are right next to each other...

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