Physics (AS & A Level) · Oct / Nov 2016 · Paper 23 · Question 5
9702
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5(a)[2]
wave incident on/passes by or through an aperture/edge wave spreads (into geometrical shadow) [2]
5(b)[3]
nλ = d sinθ substitution of θ = 90° or sinθ = 1 4 × 500 × 10–9 = d × sin 90° line spacing = 2.0 × 10–6 m [3]
5(c)[2]
wavelength of red light is longer (than 500 nm) (each order/fourth order is now at a greater angle so) the fifth-order maximum cannot be formed/not formed [2]
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