#### Starting with a sample of pure , 7/8 of it decays into Zn in 15 min . The corresponding half-­life is Option 1) Option 2) Option 3) Option 4)

As we learnt in

Number of nuclei after disintegration -

or

- wherein

Number of nucleor activity at a time is exponentional function

Hence   t = 3 T1/2

given t = 15 min.

Correct option is 1.

Option 1)

This is the correct option.

Option 2)

This is an inocrrect option.

Option 3)

This is an inocrrect option.

Option 4)

This is an inocrrect option.