A radioactive substance emanates `:`

A radioactive substance emits radiations :

The activity of a radioactive substance becomes from 8000 Bq to 1000 Bq in 12 days . What is the half-life of the radioactive substance ?

A radioactive substance reduces to 1/32 of its original value in 300 days. The half life of radioactive substance is

Alpha rays emitted from a radioactive substance are

Alpha rays emitted from a radioactive substance are