radioactivity

Question 1

What are radioactive substances. Give 2 examples

Answer 1

The substances which disintegrate or decay by the spontaneous emission of radiations are called the radioactive substance.

Uranium , Radium

Question 2

Radioactivity is a nuclear phenomenon

Answer 2

Any physical or chemical change does not change the nature of radioation emutted by the substance and its decay. this cannot be due to electrons hence it is due to the nucleus

Question 3

define radioactivity

Answer 3

it is the process of spontaneous emission of alpha or beta and gamma radiations from the nucles of atoms during their decay