45) A multiple slit diffraction grating has a slit separation of 2.00x106 m. Fin

Question

45) A multiple slit diffraction grating has a slit separation of 2.00x106 m. Find the wavelength of the monochromatic light that will have its second order (m 2) bright fringe diffracted through an angle of 43.40. (1 nm - 10 m) a. 616 nm b. 500 nm c. 687 nnm d. 120 nm 46) Light of wavelength 540 nm is incident on a slit of width 0.150 mm, and a diffraction pattern is produced on a screen that is 3.00 m from the slit. What is the width of the central bright fringe? (1 nm 109 m) a. 1.44 cm b. 0.720 cm c. 2.16 cm d. 1.76 cm 47) A Young's double-slit apparatus is set up so that a screen is positioned 1.6 m from the double slits, and the spacing between the two slits is 0.0315 mm. What is the distance between alternating bright fringes on the screen if the light source has a wavelength of 630 nm? (1 nm 10 m) a. 0.016 m b. 0.047 m c. 0.025 m d. 0.032 m

Explanation / Answer

45)

Use eqn,

dsin?=m

?= dsin?/m

Plugging values,

?=(2.00*10^-6*sin43.4)/2

?= 6.87*10^-9

?= 6.87nm

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