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*  Beta particle - Wikipedia
A beta particle, sometimes called beta ray, denoted by the lower-case Greek letter beta (β), is a high-energy, high-speed ... Although the beta particles given off by different radioactive materials vary in energy, most beta particles can be stopped by ... He found that e/m for a beta particle is the same as for Thomson's electron, and therefore suggested that the beta particle is ... Strontium-90 is the material most commonly used to produce beta particles. Beta particles are also used in quality control to ...
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*  What is the wavelength of the photon emitted when a hydrogen atom goes from the second energy level to the first energy level? ...
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