Physics (AS & A Level) · May / June 2016 · Paper 21 · Question 5
9702
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The variation with time t of the displacement y of a wave X, as it passes a point P, is shown in Fig. 5.1. –4.0 –3.0 –2.0 –1.0 0 1.0 2.0 \ / cm 3.0 4.0 0 1.0 2.0 3.0 4.0 5.0 W / ms ZDYH ; Fig. 5.1 The intensity of wave X is I.
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5(a)[2]
T = 4 (ms) or 4 × 10–3
5(b)[3]
intensity ∝ (amplitude) 2 and amplitude = 2.8 (2.83) (cm) curve with same period and with amplitude 2.8 cm curve shifted 1.0 ms to left or to right of wave X [3]
5(c)(i)[4]
gradient = (4.5 – 2.4) × 10–3 / (3.25 – 1.75) [= 1.4 × 10–3] wavelength = 0.45 × 10–3 × 1.4 × 10–3 = 6.30 × 10–7
5(c)(ii)[2]
(Gradient is equal to λ/a, therefore) gradient of line is reduced. (1)
Value of x will be reduced for all values of D, or new line is completely below old line, or intercept is less. (1)
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