The graph in figure shows how the count-rate A of a radioactive source as measured by a Geiger counter varies with time t. The relationship between A and t is (Assume ln 12 = 2.6)

Engineering

Physics

Errors

Calculus

Radioactivity New

Question

The graph in figure shows how the count-rate A of a radioactive source as measured by a Geiger counter varies with time t. The relationship between A and t is (Assume ln 12 = 2.6)

A = 2.6 e^–0.1t

A = 12 e^–10t

A = 2.6 e^–10t

A = 12 e^–0.1t

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y = mx + C
lnA = 2.6 – $\frac{t}{10}$
A = e^2.6 e^–t = 12e^–t/10