The half line of a radioactive element is `2n` year. The fraction decayed in `n` year.

The half of a radioactive sample is 2n year. The fraction left undecyed after n year is:

Mean life of a radioactive element is one year. Then its half life is (in year)

The half life of a radio isotope is 5 years . The fraction which will decay in 15 years , will be

The half life of a radioactive substance is 13 years. The decay constant is

The half-life periof of a radioactive substance is x years. The fraction remaining after 2x years is………….. .

The half-life periof of a radioactive substance is x years. The fraction remaining after 2x years is………….. .