The activity of a radioactive sample falls from `600 s^(-1) to 500 s^(-1) in 40 minutes. Calculate its half-life.

The activity of a radioactive sample decreased from 350 s^-1 to 175 s^-1 in one hour. Determine the half-life of the species

Activity of a substance changes from 700 s^(–1) to 500 s^(–1) in 30 minute. Find its half-life in minutes

Activity of a substance changes from 700 s^(–1) to 500 s^(–1) in 30 minute. Find its half-life in minutes

Activity of a substance changes from 700 s^(–1) to 500 s^(–1) in 30 minute. Find its half-life in minutes

The activity of a radioactive isotope falls to 12.5% in 90 days. Calculate the half life and decay constant.

The activity of a radioactive isotope falls to 12.5% in 90 days. Calculate the half life and decay constant.

The activity of a radioactive isotope falls to 12.5% in 90 days. Calculate the half life and decay constant.

The activity of a radioactive isotope falls to 12.5% in 90 days. Calculate the half life and decay constant.