Thallium-201 is a radioactive isotope that undergoes first-order decay. when the concentration of 201tl is 0.0042 m, its half-life is 73.0 hours. what is the half-life of 201tl when its concentration is 0.0136 m? (a) 51.0 hours(b) 73.0 hours(c) 123 hours(d) 236 hours
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