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(a) What visible wavelength has its fourth-order maximum at an angle of $25.0^\circ$ when projected on a 25,000-line-per-centimeter diffraction grating? (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?
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Final Answer
  1. $42.3 \textrm{ nm}$
  2. $42.3 \textrm{ nm}$ is shorter than the shortest wavelength in the visible spectrum ($380 \textrm{ nm}$
  3. The number of lines per centimeter is too large.
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OpenStax College Physics Solution, Chapter 27, Problem 41 (Problems & Exercises) (1:30)

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