Minimum Energy for Bragg Reflection in Cubic Crystals

AI Thread Summary
To determine the minimum energy for X-rays to achieve non-trivial Bragg reflection in a cubic crystal with atomic spacing of d = 0.2 nm, the relevant equation is 2dsinθ = nλ. The user expresses confusion about the topic and lacks lecture notes on Bragg reflection, relying on past experimental knowledge. They derive the energy formula E = nhc/(2dsinθ) and consider substituting values to find the solution. Clarification on the correct approach and further guidance on the calculations is sought. Understanding the relationship between wavelength, energy, and atomic spacing is crucial for solving this problem.
nmsurobert
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Homework Statement


A cubic crystal has a spacing between atoms of d = 0.2 nm. What is the minimum energy for X-rays such that non-trivial Bragg reflection may occur (peak with n =1)?
Write your answer in units of keV.

Homework Equations


2dsinθ = nλ

The Attempt at a Solution


i have no idea what I am doing. i don't remember the instructor talking about this nor can i find lecture notes on bragg reflection.
the only reason i know the "relevant equation" is because of a class i took semester where we did an experiment to show bragg reflection.

any advice would be appreciated. the second question is similar to this one.
 
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i found E = nhc/(2dsinθ)

if 2dsinθ = nλ then i do this ... E = (n(nhc))/2d and just plug numbers in?
 
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