![]() ![]() ![]() (Click buttons above and below the digits in the meter to raise and lower the value. Push the Grid button on the phosphor screen, and set the Magnetic Field to 30 T. It may be helpful to drag the lab window down and left and the phosphor screen window up and right in order to minimize overlap. What do you observe? The phosphor screen detects charged particles (such as electrons) and it glows momentarily at the positions where the particles impact the screen. Tum on the Phasphor Screen by clicking on the red green light switch. Whar source is used in this experiment? Drag your cursor over to the source to identify it Whar ope of charge do electrons harve? What detector is used in this experiment? 3. The lab will open in the Quantum laboratory. Start Viraal Chemlah, select Atomic Theory, and then select Thomson Cathode Ray Tube Experiment from the list of assignments. Thomson could not obtain either in his cathode ray tube experiments and had to be satisfied with just the charge-to-mass ratio. Knowing the charge-to-mass ratio (q/m.) and either the charge on the electron or the mass of the electron would allow you to calculate the other. In 1897, Thomson showed that if you could measure how far a beam of electrons was bent in an electric field and in a magnetic field, you could determine the charge-to-mass ratio (g/me) for the particles (electrons). John Joseph (I.J.) Thomson was a physics professor at the famous Cavendish Laboratory at Cambridge University. In order to understand the nature of these particles, scientists wanted to know how much charge they carried and how much they weighed. 1-1: Thomson Cathode Ray Tube Experiment As scientists began to examine stoms, their first discovery was that they could extract negatively charged particles from atoms. ![]()
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