Question

9. A student using a diffraction grating ruled with 6.20 x 104 lines/m to measure the frequency of some monochromatic light. If the nodal lines are 0.0522 m apart at a distance of 1.50 m from the grating, what is the frequency of the light used? (5.3 x 1014 Hz) 10. Using the information in question 9, determine the distance between nodal lines if the grating was changed to 9.30 x 104 lines/m while all other variables remained unchanged. (0.0783 m)

Answer 1

We know d (grating Sheen) = 6 - 20 x 10th m distence assen, D = 1.50 y=0.0522 (two feet spot distune , we know wavelaigh, x = V Veccity of light 1. frequens IF Y y = not nas for n=0,42 y = DX Y fe DV. 1.50X 3x108 *?oºx 6.207104 7. y d 0.0522 frequere, f= 5.3x1074 Hz ~ (1) if I h = 9.30Xlo A chinen yeke DXB 1.50X3X600 x 9:30X/04 - 5.381014 L Y = 0.0783 m

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