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8 is c as there is positive gradient at the beginning whereas d says there is negative 12 isnt b as the interference pattern is formed all around it, rather than just behind it like it says in b. i said it was a

i reckon that was probably the easiest 3 unit paper ive done. even got question 7 which i havent done before:)

i proved triangle XQB was isosceles, so QX=BQ then proved XQC was also isosceles so QX=QC therefore BQ=QC so it bisected it