A beam of light was passed through a diffraction grating with 684 lines/mm, and the pattern was observed on a paper placed 69.7 cm past the grating. The distance from the center bright spot,to the third bright spot was 122 cm. What was the wavelength of the light in nanometers (nm)? (State answer as an integer. Do not include unit in answer.

University Physics Volume 3
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ISBN:9781938168185
Author:William Moebs, Jeff Sanny
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Chapter4: Diffraction
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Problem 86AP: How far apart must two objects be on the moon to be distinguishable by eye if only the diffraction...
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A beam of light was passed through a diffraction grating with 684 lines/mm, and the pattern was observed on a paper placed 69.7 cm past the grating. The distance from the center bright spot,to the third bright spot was 122 cm. What was the wavelength of the light in nanometers (nm)? (State answer as an integer. Do not include unit in answer.)

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