Why should a radioactive substance not be touched by hand ?

A radioactive substance emanates :

Why should curd and sour substances not be kept in brass and copper vessels?

A radioactive substance emits radiations :

The half-life period of a radioactive substance is 5 min . The amount of substance decayed in 20 min will be

When a radioactive substance is subjected to a vacuum, the rate of disintegration per second

From a radioactive substance n_1 nuclei decay per second at an instant when total number of nuclei are n_2 . Find half-life of the radioactive substance.

Half life of a certain radioactive substance is 6 hours. If you had 3.2 kg of this substance in the beginning, how much of it will disintegrate in one day?

A container is filled with a radioactive substance for which the half-life is 2 days . A week later, when the container is opened, it contains 5 g of the substance. Approximately how many grams of the substance were initally placed in the container ?

When the quantity of a radioactive substance is increased two times, the number of atoms disintegrating per unit time is

A radioactive substance (parent) decays to its daughter element . The age of radioactive substance (t) is related to the daughter (d)/parent (p) ratio by the equation :