General Physics, 2nd Edition
General Physics, 2nd Edition
2nd Edition
ISBN: 9780471522782
Author: Morton M. Sternheim
Publisher: WILEY
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Chapter 27, Problem 2RQ
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Whether true or false that continuous spectrum of colors is seen after diffraction through grating when the light travels through a diffraction grating from a discharge in hydrogen gas.

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The dispersion curve of glass is the curve that describes how the index of refraction of glass changes as a function of the wavelength. This curve can be represented approximately by Cauchy's empirical equation, n = A + B/2² where for a specific glass in question A = 1.40 and B = 2.5 × 10 nm² (yes, those units are nanometer squared). Find the phase and group velocities for light of 500nm wavelength in that glass.
An X-ray beam of a wavelength 0.15 nm is incident on an NaCl crystal, at 25° to reflecting planes of the crystal. If the first order reflections occurred in the spectrum, find the spacing of the reflecting planes of the crystal. (а) 0.18 pm (b) 0.35 nm (c) 0.18 nm (d) 0.35 pm
If an X-ray beam of wavelength 1.4*10-10 m makes an angle of 20 degrees with a set of planes in a crystal causing first order constructive inference, at what angle will the second order line appear? A) 40 degrees B) 20 degrees  C) 43 degrees D) 4.0 degrees E) 11 degrees
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