Radioactivity was discovered by
A H. Becquerel
B M.Curie
C W. Roentgen
D J.J Thomson
The emission of rays from nucleus is called
A Radioactivity
B Atomic spectra
C Atomic process
D Chemical process process
Alpha rays are nuclei of
A Radium
B Uranium
C Helium
D Hydrogen
The process of spontaneous emission of a, B and y rays from the nuclei of heavy elements is called
A Photoelectric effect
B Atomic spectra
C Radioactivity
D Fission reaction
Gamma rays rays are
A High energy electromagnetic radiations
B Positively charge particles
C Negatively charge particles
D Neutral particles
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