Question

Which radiation emitted by the radioactive substance have little effect on photographic plate on ZnS screen

Answer 1

Answer:

Bacquerel (1886) discovered that uranium salts emit some active rays called radioactive rays and the property itself was known as radioactivity. Potassium uranyl sulphate was the first compound in which radioactivity was observed. Madame Curie et al. (1898) found that thorium and radium are also radioactive substances.

Rutherford (1899) proved that there are two types of radiation i.e. \alpha-and \beta-rays carrying (+) ve and (-) ve charge respectively. Willard (1900) discovered the third type of radiation, i.e. \gamma-rays which is neutral. Characteristics of these three types of radiation are given below.