lab2 - Chris Lawson Chemistry Lab 2 Discovery of the...

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Chris Lawson Chemistry Lab 2 Discovery of the Electron 9/13/06 The purpose of this lab is to perform the experiment that J.J. Thomson did in 1897 to discover the electrons charge to mass ratio. First, I turned on the filament so that the electron beam hit the fluorescent screen. Then, I turned on the electron field. When setting the value of the electron field, the concentration of red electrons moved to -0.0374 m. By turning the magnetic field level to -0.113G, the red sport went back to 0m. Seeing that the magnetic field unit was gauss(G), I had to change it to an SI unit. The corresponding SI unit is the telsa(T), whereas 1T=10,000G. Then, I substituted the distance the beam was deflected for y. Then, I substituted E for the electric field and B for the magnetic field. Using L, which equals .10m, the length of the deflecting plate and equation x=2.0m for the distance, I found the mass ration of the electron(q/m). It looked like this: q/m = -0.0374 m(15 V/m) . (.10m)(-1130T)²((.10m/2 + .20m)) Then: q/m = -.561V/m . 19153.5 mT Then: q/m = -2.92 x 10^-5 V/mT
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