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Dr N Bohr on the Theory of the Decrease of Velocity
Dr S A Shorter on the Application of the Theory
Mr S B McLaren on the Theory of Radiation
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absorbed absorption activity aluminium amount apparatus appears approximately assume atom beam becomes calculated cent charge compared complete considerable considered constant containing corresponding curve determined diffusion direction discharge distance effect electric electrons elements emanation emission energy equal equation experimental experiments expression fact force frequency given gives greater halo heating Hence hydrogen increase intensity ionization ions lead less light mass matter maximum means measurements metal method molecules motion nature negative observed obtained original oxygen particles passing period Phil placed plate platinum positive possible potential present pressure probably produced proportional quantity radiation radium range ratio rays relation relative scattering shown similar solution spectrum sublimate substance surface TABLE taken temperature theory thickness thorium tube unit velocity waves weight wire