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Final Marks with Comments

Question	Mark	Comment
1	8/10	(i) Very good, but Be does not have very high absorption for X-rays: quite the opposite; (ii) Second point not correct; (iii) OK
2	4/10	(iii) -ve b value for hydrogen does not make it unsuitable for diffraction
3	2/10	(i) A and C correctly identified, but not B; (ii) Wrong
4	5/10	(i) Bit vague; (ii) Errors in calculation
5	4/10	Correct for part (i), but remainder wrong
6	10/10	Excellent
7	2/10	Many errors & incomplete
8	4/10	OK for first part, but remainder incomplete
9	2/10	Mix up between Lorentz and polarisation in (i), remainder incomplete
10	0/10	Not attempted
11	0/10	Not attempted
12	4/10	Many errors, but calculation correct in (iv)
13	3/10	Explanations too brief and vague
14	0/10	Wrong & incomplete
15	2/10	OK, but incomplete