Reference: https://phet.colorado.edu/en/simulations/wave-interference

Pane 1. Denote this screen distance as "R", and record your measurement, R = _nm (just under 2500 nm). 2. From the very lower right, copy the Slit Separation, d= nm. 3. On the screen, measure the first order maxima spacing. This has you grab and move the tape measure to the lower center of the first order maxima, then grab the end of the tape measure and rotate it up to the upper center of the first order maxima (as shown). This is double the distance from the "center of the central maxima" to either first order maxima. So divide the tape measure reading by two, and call this the "y value of the distance, between central and first order maxima", "y". was Do this and record your value of y =_ nm (you can see that I measured y = 935.25 nm = 1 1870.5). 4. Now we apply m ) = d sine to our data, to calculate the wavelength . a. Calculate @ first. We know that tan@ = y / R. 0=_deg, nearest tenth. b. Fill in the order, m =_. Then, A= _nm, nearest tenth. c. Does this "fit" with the color of the light and the following spectrum? Yes/No. 75 x 10 4 Hz 6 x 1014 Hz 5 x 1014 Hz 4 X 1014 Hz UV 400 nm 500 am 600 nm 700 nm 5. Repeat the above, for longer wavelength "near infrared light". Move the Frequency slider all the way to the left. a. R= nm, d= _nm (unchanged from 1 and 2). b. Same calculation as in 3 above, center of central maxima to first order maxima, y = _nm (after dividing by 2) C. Same calculation as in 4a above, @ = _deg, nearest tenth. d. Same calculation as in 4b above, m =_, A= nm, nearest tenth. e. Does this "fit" with the color of the light and the spectrum shown above? Yes/No