Which of the following is a correct statement?

Options

A. Beta rays are same as cathode rays.
B. Gamma rays are high-energy neutrons.
C. Alpha particles are singly ionized helium atoms.
D. Protons and neutrons have exactly the same mass

Answer

a

Explanation

Both the beta rays and the cathode raye are made up of electrons. So, only option (a) is correct.
Gamma rays are electromagnetic waves.
Alpha particles are doubly ionized helium atoms.
Protons and neutrons have approximately the same mass.
Therefore, (b), (c ) and (d) are wrong options.