List of top Chemistry Questions on Radioactivity

The half-life period of a radioactive element is \(1.5 \times 10^{10}\) years. Calculate the time in which the activity of the element is reduced to 75% of its original value. \[ \text{Given : } \log 2 = 0.30,\; \log 3 = 0.48,\; \log 4 = 0.60 \]

The half-life of radioactive isotope Zn$^{65}$ is 245 days. Find the time after which activity of Zn sample remains 75% of its initial value.

When a radioactive material emits an \(\alpha\)-particle, its position in the periodic table

The dimensional formula for the product of the decay constant \(\lambda\) and the mean life of a radioactive substance is

The number of \(\alpha\)-particles emitted during the radioactive decay chain from \({}^{226}_{88}\text{Ra}\) and ending with \({}^{206}_{82}\text{Pb}\) is

Cobalt (60) isotope is used in the treatment of: