Physics (AS & A Level) · Oct / Nov 2023 · Paper 42 · Question 4
9702
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An electron in a metal rod moves randomly about a mean position. When an alternating voltage is applied to the ends of the rod, the mean position can be considered to oscillate with simple harmonic motion along the axis of the rod. Fig. 4.1 shows the variation with time t of the displacement x of the mean position from a fixed point on the axis of the rod. 0 0.1 0 4 8 0.2 0.3 0.4 x / 10–15 m t / μs Fig. 4.1
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