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A narrow X-ray beam falls on a NaCl single crystal. The least angle of incidence at which the mirror reflection from the system of crystallographic planes is still observed is equal to alpha = 4.1^(@). The interplaner distance is d = 0.28nm. How high is the voltage applied to the X-ray tube? |
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Answer» Solution :We have as in the above problem `(2picancelh c)/(LAMBDA) = EV` On the other hand, from Bragg's LAW `2d sin alpha = k lambda = lambda` SINCE `k = 1` when `alpha` takes its smaller value. Thus `V = (pi cancelh c)/(edsin alpha) = 30.974kV~~31kV`. |
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