A-LevelPhysicsWaves9702/12 · Feb/Mar 2017 · Q281 Mark
A monochromatic plane wave of speed c and wavelength λ is diffracted at a small aperture. The diagram illustrates successive wavefronts. [Figure showing successive wavefronts G, H and point P related to diffraction through an aperture] After what time will some portion of the wavefront GH reach point P?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
A3λ
2c
B2λ
c
C3λ
c
D4λ
c
✓ Correct answer
C: 3λ c
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