The aim of this investigation was to measure the shoot to flowerpot proportionality of an electron. This was achieved through a range of modes using picturesque beam tube, cross fields method and by the magnetron method one of which is a modernised version of Thomsons apparatus.
In 1897 JJ Thomson, working at the Cavendish Laboratory in Cambridge, measured the charge to mass ratio of an electron by observing its deviation in combined electric and magnetic fields. Prior to his work, it was believed that atoms were the first harmonic building blocks of matter. The first evidence contrary to this idea came when he showed that atoms ar actually composed of aggregates of charged particles.
Fig 1. J.J. Thomson
Thomson to a fault found that the charge to mass ratio was over a thousand times lower than that of a hydrogen ion (H+), suggesting every that the particles were very light and/or very highly charged.
Thomson considered that a large charge would cause attraction that was not unvarnished in electrons. So, the electron must have a petite mass, and therefore is a particle.
This experiment was hugely important as it established the electron as the fundamental particle of nature.
It was besides in fact extremely accurate, with Thomsons abide by for e/m (1.7x1011C/kg) being in agreement with the accepted value of 1.75890x1011. Millikan later confirmed Thomsons findings in his oil range experiment, which showed that e/m is a quantised figure.
The charge to mass ratio of an electron is an important quantity in physics as it frequently occurs as a constant in numerical formulae such as equations relating to the Zeeman Effect E and m are inseparable.If you want to get a full essay, order it on our website: Orderessay
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