( 1) Gamma rays are electromagnetic waves of very short wavelength. (2) Gamma rays have no mass. (3) Gamma rays have no charge. (4) The wavelength of gamma ray is much less than the wavelength of visible light. (5) Gamma ray travels at a speed of 3 10 ৮ ms − 1 . (6) Gamma rays are not scattered by electric field. (6) Gamma rays are not scattered by magnetic field. (6) Gamma rays cause a reaction on the photographic plate. (9) They cause a reflection by falling on an object. (10) Gamma rays have ionizing power. This power is much lower than that of alpha and beta rays. (11) Gamma rays have piercing power. This piercing power is much higher than that of alpha and beta rays. (12) It is called electromagnetic wave like light. Gamma ray has all the luminous properties like reflection , refraction , excitation , refraction etc.