| Date | November 2012 | Marks available | 1 | Reference code | 12N.1.SL.TZ0.17 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 0 |
| Command term | Question number | 17 | Adapted from | N/A |
Question
Waves emitted from sources X and Y have equal wavelengths and are initially in phase. The waves interfere destructively at point P, where the path difference is 0.60m.
What is a possible value for the wavelength of the waves?
A. 0.20 m
B. 0.30 m
C. 0.40 m
D. 0.60 m
Markscheme
C
Examiners report
Candidates needed to recognise that the path difference needs to be equal to an odd number of half-wavelengths for destructive interference to happen. With a path difference of 0.60m this is true only for wavelength of 0.40m giving a half- wavelength of 0.20m and thus three half-wavelengths occurring.
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