Electromagnetic WavesHard

Question

For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is :-

Options

A.

20

B.

10

C.

30

D.

15

Solution

N0 = 600, N' = 450
N = N0 – N'
N =150
NNo=12t/TH      ⇒150600=12t/10⇒14=12t/10          ⇒122=12t/102=t10⇒t=20 min

Create a free account to view solution

View Solution Free
Topic: Electromagnetic Waves·Practice all Electromagnetic Waves questions

More Electromagnetic Waves Questions

For plane electromagnetic waves propagating in the z direction, which one of the following combinationgives the correct ...A radioactive sample disintegrates by 10% during one month. How much fraction will disintegrate in four months :-...A radioactive sample at any instant has its disintegration rate 5000 disintegrations per minute. After 5 minutes, the ra...The electric field of an electromagnetic wave in free space is given by = 10 cos(107 t + kx)V/m, where t and x are in se...An electromagnetic wave in vacuum has the electric and magnetic fields , which are always perpendicular to each other. T...