Physics (AS & A Level) · Feb / March 2016 · Paper 42 · Question 12
9702
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12(a)(i)[1]
the penetration of the beam [1]
12(a)(ii)[1]
either decrease the accelerating voltage or decrease voltage between cathode and anode [1]
12(b)[2]
advantage: image gives depth / image is 3D / final image can be viewed from any angle disadvantage: greater exposure / more risk to health / more expensive / person must remain stationary [2]
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