9702 November 2018 Paper 12 Worked Solution | A-Level Physics
1 A 11
D 21 D 31 C
2 B 12
C 22 D 32 D
3 B 13
A 23 B 33 A
4 A 14
C 24 A 34 A
5 A 15
D 25 D 35 D
6 C 16
A 26 D 36 B
7 B 17
A 27 A 37 B
8 B 18
B 28 B 38 C
9 B 19
A 29 A 39 C
10 D 20
D 30 C 40 A
28 - Ans: B.
What happens when waves pass through a gap equal to their wavelength?
29 - Ans: A.
Two sources of microwaves P and Q produce coherent waves with a phase difference of 180. The waves have the same wavelength λ.
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