Question

The half-life of radium is 1600 years. In what time will the mass of radioactive radon decrease by 4 times?

Answer 1

Answer:

As radioactive decay is first-order kinetic

half-life given is 1600 years in 6400 no. of half-life is

n=

1600

6400

=4

fraction of element remains after n half life is given by =

2

n

1

Hence fraction of radium remains after 4 half life

=

2

4

1

=

16

1

.