Bragg's Law (X-Ray Analytical Methods)

[Kelly Green]

Homework Statement

Explain using word, diagrams, and/or calculations..
(1) Why must n always be <= 2d/λ?
(2) If λ is significantly greater then d, why will no diffraction occur?

Homework Equations

Bragg's Law nλ=2dsinθ
n has its maximum when sinθ is 1 (at 90°)

The Attempt at a Solution

I am taking an X-Ray Analytical Methods course. I understand the general concept of Bragg's Law, but am having a hard time answering / proving the two questions above, perhaps I am over thinking it? Any feedback and/or direction would be greatly appreciated.

 

[Greg Bernhardt]

I understand the general concept of Bragg's Law, but am having a hard time answering / proving the two questions above, perhaps I am over thinking it?

What have you tried and what specifically are you having trouble with?

 

[Kelly Green]

sorry, I didn't put the problem statement in the correct area of the template (edited).

rg: Bragg's Law nλ=2dsinθ - Explain using word, diagrams, and/or calculations..
(1) Why must n always be <= 2d/λ?
(2) If λ is significantly greater then d, why will no diffraction occur?

I understand the concept of constructive and deconstructive interference, but am having a hard time mathematically proving it..