ringPhysics HW12 Ch 28-Google Chrome re | https//session .masteringphysics.com/m
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Question
ringPhysics HW12 Ch 28-Google Chrome re | https//session .masteringphysics.com/myct/itemView assignmentProblemiD-89536184 V12 Ch 28 ng X-ray Diffraction 1 of 10> Constants Part A hen an x-ray beam is scattered om the planes of a rystal, the scatered beam creates an interterence attern. This phenomenon is called Bragg scattering or an observer to measure an interference maximum wo conditions have to be satistied An x-ray beam with wavelength 0 120 nm is deected at a crystal As the angle of incikdence increases, you coserve me first strong interference maximum at an angle 68 0 What is the spacing d between the planes of the crysta? Express your answer in nanometers to three significant rigures 1. The angle of incidence has to be equal d 0.160 m igure 1 of1 V Correct Part B Find the angle , at which you will ind a second maximum Express your answer in degrees to three significant figures 415 dcoseExplanation / Answer
from the Braggs law
2 d sin theta = m lamda
for third maximum
sin theta = m lamda/ 2d
theta = sin^-1 ( m lamda/ 2d)
= sin^-1 ( 3 * 0.120 nm/ 2*(0.160 nm)
=not poosible
No, because the existence of such a maximum produces an unphysical result such as the sine of an angle being greater than one is the correct answer
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