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NEET Physics Nuclei Questions Solved

A radioactive sample at any instant has its disintegration rate 5000 disintegration per minute. After 5 minutes, the rate is 1250 disintegrations per minute. Then, the decay constant (per minute) is
(a) 0.8 In 2 (b) 0.4 In 2
(c) 0.2 In 2 (d) 0.1 In 2

(b) $λ = \frac{\log_{e} \frac{A_{1}}{A_{2}}}{t} = \frac{\log_{e} \frac{5000}{1250}}{5} = 0.4 \ln 2$

Difficulty Level:

(1)
15%
(2)
60%
(3)
15%
(4)
10%

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