The activity of a radioactive sample is $1.6\, curie$ and its half-life is $2.5 \,days$. Its activity after $10\, days$ will be ………. $curie$

The half life period of a radioactive substance is $5\, min$. The amount of substance decayed in $20\, min$ will be……….$\%$

At any instant the ratio of the amount of radioactive substances is $2 : 1$. If their half lives be respectively $12$ and $16$ hours, then after two days, what will be the ratio of the substances

Three fourth of the active decays in a radioactive sample in $3/4\, sec$. The half life of the sample is

Radioactive nuclei that are injected into a patient collect at certain sites within its body, undergoing radioactive decay and emitting electromagnetic radiation. These radiations can then be recorded by a detector. This procedure provides an important diagnostic tool called