   Chapter 27, Problem 41PE

Chapter
Section
Textbook Problem

Unreasonable Results(a) What visible wavelength has its fourth-order maximum at an angle of 25.0° 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?

To determine

(a)

What visible wavelength has its fourth-order maximum at an angle of 25.0° when projected on a 25,000-line-per-centimeter diffraction grating?

Explanation

Given info:

d=1cm25000=400nmθ=250m=4

Formula used:

There is constructive interference for a diffraction grating when,

dsinθ=mλ,   <

To determine

(b)

To determine

(c)

Which assumptions are unreasonable or inconsistent?

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