Chadwick's experiment and proton velocity

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Chadwick measured proton velocity in the polonium-beryllium experiment by likely accelerating protons through a voltage, using the relationship K=qV to determine kinetic energy. The charge of the protons and the applied voltage allowed for calculations of their drift velocity. Additionally, the deflection of particles in a magnetic field could be analyzed using the Lorentz force equation, F=qvB*sin(x). While the exact methods are debated, the principles of voltage acceleration and magnetic deflection are central to understanding proton behavior in this experiment. Overall, the discussion highlights the complexities in accurately measuring proton velocity in nuclear experiments.
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How did he measue the proton velocity in the polonium-beryllium experiment? The only source with some description describes his using current as a means to do so - but sure that would require knowledge of the number of protons in order to ascertain the drift velocity?
 
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I Read a little about the experiment . He may have accelerated the protons through a voltage. K=qV k= kinetic energy q=charge V=voltage . And then he could have deflected the particles in a magnetic field
using the Lorentz force . F=qvB*sin(x)
Not sure about the Lorentz force but accelerating them through a voltage would be reasonable.
Not sure though .
 
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