Physics (AS & A Level) · Feb / March 2016 · Paper 22 · Question 4
9702
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4(a)(i)[1]
Displacement of particles perpendicular to direction of energy propagation
4(a)(ii)[2]
waves meet / overlap (at a point) (resultant) displacement is sum of the individual displacements
4(b)(i)[2]
λ = vT or λ = v / f and f = 1 / T λ = 4.0 × 1.5 λ = 6.0 (cm)
4(b)(ii)[3]
path difference [= (44 cm – 29 cm) / 6 cm] = 2.5λ either waves have path difference = (n + ½)λ or waves have phase difference = 180° so destructive interference
4(c)(i)[2]
intensity ∝ (amplitude) 2 ratio = (0.602 / 0.902) = 0.44
4(c)(ii)[1]
phase difference = 90°
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