Diffraction Grating calculation of light wavelength

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Diffraction AP Physics B.

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Presentation transcript:

Diffraction Grating calculation of light wavelength And you

Question #1 A diffraction grating has 20,000 slits/inch. What is the distance between 2 slits (in meters)? * 2.54 cm = 1 in 1.27 x 10-6 m

Question #2 If the distance between the central bright spot and the 1st bright spot to the side is 0.43 m, and the length between the diffraction grating and the wall is 1.6m, then what is the wavelength of the light being used? 3.41 x 10-7 m

Question #3 If the distance of the diffraction grating is increased to 2.63 x 10-4 m, then which of the 4 variables (X, L, d, or λ) will change? X

Question #4 What will the new measurement of X be? .002 m

Question #6 Therefore, if you increase the d (distance between lined on the diffraction grating) the X (diffraction pattern) will increase, or decrease? Decrease (get smaller)