A detector measures the count rate from a sample of a radioactivenuclide. The graph shows the variation with time of the count rate.[1 mark]The nuclide has a half-life of 20 s. The average background count rate is constant.201918171615count rate/s?¹ 1413121110980510152025time/sWhat is the average background count rate?A. 1 s?¹B. 2 s?¹C. 3 s?¹D. 4 s?¹
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