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ATOMS AND ELECTRONS
THERMIONIC AND PHOTOELECTRIC EFFECTS
MASS AND ENERGY
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alpha particles amount of energy angle angular momentum atomic mass atomic number beam beta decay beta particles binding energy Bohr bombardment called capture chamber charged particles collisions compound nucleus cosmic rays crystal cyclotron deuteron diagram diffraction pattern discovery disintegration ejected elec electric field electromagnetic electron volts elements emission emitted energy levels equation experiments Figure filament fission frequency gamma rays gamma-ray photon graph half-life helium ionization ions isotope kinetic energy known magnetic field mass number measured mesons metal molecules move neutrino neutrons nuclear reactions nucleons nucleus number of electrons observed orbit path periodic table photoelectric effect photographic plate pi-meson positively charged positron principal quantum produced proton radiation radioactive radioactive isotope radium released scattered sodium spectra spectrograph spectrum lines speed of light spin stable subshells target theory tion tron uranium valence electron velocity voltage volts wave wavelength whole number x-ray tube zero