The half life of a radioactive substance is 20 minutes. The approximate time interval between the time when of it has decayed and time when of it had decayed is
As we learnt in
Number of nuclei after disintegration -
or
- wherein
Number of nucleor activity at a time is exponentional function
at t = t2,
or (1)
at t = t1,
or (2)
Divide (1) in (2)
or
or
or
Correct option is 3.
Option 1)
This is an incorrect option.
Option 2)
This is an incorrect option.
Option 3)
This is the correct option.
Option 4)
This is an incorrect option.
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