A-level PHYSICS 7408/3A Paper 3 Section A Mark scheme June 2021 Version: 1.1 Final
for 1 allow ‘reads / measures height of detector’ / ‘distance from detector to bench’; reject ‘measures height of clamp T’ if ‘subtracts 138’ is not seen; allow ‘subtract distance from source to bench’ / ‘between source and bench’ / ‘height of source from ground’ / ‘position of top / open end / mouth of source’; allow ‘measures height of the detector and the source and finds difference’; condone ‘reversed’ subtraction, for 2 expect a triangular 90 set-square in contact with a vertical edge of the ruler, top edge aligned with open end of the detector, eg .....
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- A-level PHYSICS 7408/3A Paper 3
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- A-level PHYSICS 7408/3A Paper 3
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- July 6, 2022
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- 2021/2022
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a level physics 74083a paper 3 section a mark scheme june 2021 version 11 final
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finds d by reading position of lower end of detector subtracts 138 mm or wtte 1
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annotates figure 1 to show
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