nuclei Question 39

Question: Q. 1. (i) Define the terms (i) half-life (T1/2 ) and (ii) average life (τ). Find out their relationships with the decay constant (λ).

(ii) A radioactive nucleus has a decay constant, λ= 0.3465 (day) 1. How long would it take the nucleus to decay to 75 of its initial amount ?

R U [Foreign 2014]

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Solution:

Ans. (i) (a) Half life : The time taken by a radioactive nuclei to reduce to half of the initial number of radio- nuclei.

1

=0.66 hour  =0.66×60 min =39.6 minutes 



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