Unformatted text preview: 53. Braggâ€™s law gives the condition for a diï¬€raction maximum:
2d sin Î¸ = mÎ»
where d is the spacing of the crystal planes and Î» is the wavelength. The angle Î¸ is measured from the
surfaces of the planes. For a secondorder reï¬‚ection m = 2, so
d= mÎ»
2(0.12 Ã— 10âˆ’9 m)
= 2.56 Ã— 10âˆ’10 m = 256 pm .
=
2 sin Î¸
2 sin 28â—¦ ...
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.
 Fall '08
 SPRUNGER
 Physics

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