Experiment 4: Charge to mass ratio (e/m) of the electron
Rutherford scattering experiments (1911): Matter is made of compact localized nuclei Development of Quantum Mechanics (1920's): The microscopic constituents of matter follow novel and surprising laws of physics! Quanta (electrons) enclosed in a continuous positive distribution PHYS 1493/1494/2699: Exp. 4 – e/m of the electron
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The model proposed by Rutherford explained the observation in the -ray scattering experiments as shown below in Fig 3.4. Fig 3.4 : Explanation of the results of α- ray Fig. 3.5 : Failure of Rutherford’s scattering experiment. model However, there was a problem with the Rutherford’s model. According to the Maxwell’s
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scattering of alpha particles by gold foil, in 1911 by Ernest Rutherford (1871–1937) established the nuclear model of the atom, which then became the basis of the quantum theory of hydrogen atom given in 1913 by Niels Bohr (1885–1962). On the other hand, the concept of antiparticle was first introduced theoretically by
Rutherford model was based on the alpha particle scattering experiment 3. He proposed 1) all the positive charge of an atom is concentrated in the nucleus . 2) an atom consists of a positively -charged nucleus with a cloud of electrons surrounding the nucleus . Neils Bohr (1885-1962)
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