The half$‐$life of radium is $1550$ years. Calculate its disintegration constant $\left(\mathrm{\lambda }\right)$.

Copy and complete the following table for a radioactive element whose half-life is $10$ minutes. Assume that you have $30 \mathrm{g}$ of this element at $t=0$.

For a radioactive substance, write the relation between half-life $\left(T\right)$ and disintegration constant$\left(\lambda \right)$.

For a radioactive substance, write the relation between mean life $\left(\tau \right)$ and disintegration constant $\left(\lambda \right)$.