(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

First-order Bragg diffraction is observed at 25.9degrees relative to the crystal surface, with spacing between atoms of 0.26 nm.

a)What is the wavelength of the X-rays?

b)At what angle will second order be observed?

2. Relevant equations

m[tex]\lambda[/tex]=2dsin[tex]\phi[/tex]

3. The attempt at a solution

I solved part b: [tex]\lambda[/tex]=(2dsin[tex]\phi[/tex])=(2(.26*10^-9 m)(sin25.9deg)=.23nm which is correct.

For part a I tried: sin[tex]\phi[/tex]=(m[tex]\lambda[/tex])/(2d)=((2)(.23*10^-9 m))/((2)(.26*10^-9))=62.2 Which is apparently close because mastering physics says,"Not quite. Check through your calculations; you may have made a rounding error or used the wrong number of significant figures." Please help! I am down to one attempt and need to get it right this time. Thx!

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: X-ray diffraction

**Physics Forums | Science Articles, Homework Help, Discussion**