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Conduction through gases
Radioactive substances and their radiations
151 other sections not shown
a-particles a-rays absorbing absorption actinium aluminium apparatus atomic number atomic weight beam calculated cathode rays chemical corresponding crystal curve decay deflection difference of potential direction discharge tube disintegration distance effect electric field electrometer electroscope element emission emitted energy equal equation experimental experiments frequency gases given helium Hence hydrogen atom increased intensity ionization chamber ionizing agent J. J. Thomson known light lines magnetic field mass maximum mean free path measured metal method molecules negative ions nucleus number of atoms number of electrons number of ions obtained orbit parabola parallel particles passing photo-electric photo-electric effect plane positive charge positive ions positive rays potential difference pressure produced proportional quantum radio-active substance radium radium emanation ratio right angles saturation current screen shewn in Fig shews Sir J. J. Thomson spectrum surface temperature theory thermionic thickness thorium uranium velocity volts wave length wire X-rays y-radiation y-rays