Read about the Diffraction Grating in the Overview for this lab in your lab manu

Question

Read about the Diffraction Grating in the Overview for this lab in your lab manual. Suppose you are performing Activity 1-1 using a diffraction grating with 690 lines/mm. (a) What is the distance d between adjacent slits? nm (nanometers, not millimeters) (e) The expected wavelength for hydrogen's deep violet (n=6 to n=2 transition) line is 410.3 nm. At what angle do you expect to find this line's first-order maximum? ° (f) Sodium D line ( 589.3 nm) is actually two closely spaced lines, one at 589.0 nm and another at 589.6 nm. If these lines appear as their first-order maxima, how much difference in angles do you expect for the two lines? °

Explanation / Answer

Part A) distance d=1449.275nm                           (d=1/diffraction grating)

Part B) we know that d.sintheta=n*wavelength

hence sintheta=n*wavelength/d= 1*410.3/1449.275=0.28311

finally theta=16.44 degree.

PartC) path difference dx=589.6-589.0=0.6nm

Practical Based problem.

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