Which of the following is incorrect statement? A. elementary unit of charge was named as electron by Stoney. B. Line spectrum can be used determine the chemical composition of st C. violet color has the highest frequency in continuous spectrum. D. dimension of Rydberg constant is same as that of wave length E. none of the above
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Answer:
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Classical Atomic Model: Atomic model before the advent of Quantum Mechanics.
Electron
The German physicist Johann Wilhelm Hittorf undertook the study of electrical conductivity in rarefied gases. In 1869, he discovered a glow emitted from the cathode that increased in size with decrease in gas pressure. In 1896, the British physicist J. J. Thomson performed experiments demonstrating that cathode rays were unique particles, rather than waves, atoms or molecules, as was believed earlier. Thomson made good estimates of both the charge e and the mass m, finding that cathode ray particles (which he called “corpuscles”) had perhaps one thousandth the mass of hydrogen, the least massive ion known. He showed that their charge to mass ratio (e/m) was independent of cathode material. (Fig 1 shows a beam of deflected electrons.