Ncert Exercises & Solutions

Samples of two radioactive nuclides A and B are taken. $λ_{A}$ and $λ_{B}$ are the disintegration constants of A and B respectively. In which of the following cases, the two samples can simultaneously have the same decay rate at any time?

(a) Initial rate of decay of A is twice the initial rate of decay of B and $λ_{A}$ = $λ_{B}$
(b) Initial rate of decay of A is twice the initial rate of decay of B and $λ_{A}$ > $λ_{B}$
(c) Initial rate of decay of B is twice the initial rate of decay of A and $λ_{A}$ > $λ_{B}$
(d) Initial rate of decay of B is same as the rate of decay of A at t = 2 h and $λ_{A}$ < $λ_{B}$

1. (a, b)

2. (a, c)

3. (b, d)

4. (c, d)

(3) Hint: Decay rate depends on the no. of nuclei in a sample.

The two samples of the two radioactive nuclides A and B can simultaneously have the same decay rate at any time if initial rate of decay of A is twice the initial rate of decay of B and

λ_{A}

λ_{B}

. Also, when initial rate of decay of B is same as rate of decay of A at t = 2h and

λ_{A}

λ_{B}

NEET Information

courses

Company

Botany Questions

Chemistry Questions

Physics Questions

Zoology Questions