# Which of the following is correct statement ?

$(a)\;Beta\;rays\;are\;same\;as\;cathod\;rays\qquad(b)\;Gamma\;rays\;are\;high\;energy\;neutrons\qquad(c)\;Alpha\;particles\;are\;singly\;ionized\;helium\;atoms\qquad(d)\;proton\;and\;neutrons\;have\;exactly\;same\;mass$

Answer : (a) Beta rays are same as cathode rays
Explanation :
Both beta rays and cathode rays are made up of electrons . So only (a) is correct
(b) Gamma rays are electro magnetic waves
(c) Alpha particles are doubly ionized helium atoms
(d) Protons and neutrons have approximately same mass .