Electric Charge and the Electrical Structure of Matter

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…a lower wavelength. D. Gamma Radiation There three distinct types of radioactive materials: 1) a type of particle similar to high-speed helium nuclei, with poor penetrating power, called alpha particles. 2) a type of particle similar to high speed electrons, with the ability to penetrate up to several millimeters of aluminum, called beta particles . 3) a form of radiation, similar to very high energy X-rays, with the ability to penetrate even several centimetres of lead, called gamma rays .