![]() Moreover, this energy difference is the reason why the light is in the visible range. Furthermore, their de-excitement takes place by dropping to lower states at 16.57 and 16.79 eV. There are about ten peak electrons levels that lie in the range of 18.3 to 19.5 eV. Furthermore, when the accelerated electrons excite the electrons in neon to upper states, they de-excite in such a manner that there is the production of a visible glow in the gas region in which is occurring the excitation. One can clearly see the energy absorption from electron collisions in case of Neon gas. Again, an observation of a similar drop takes place at 9.8 volts.Again, there is an increase in the current as the increase in the voltage takes place to 9.8 volts.The dropping of the current is almost to zero at 4.9 volts.With the steady increase in the potential difference, there would be a steady increase of the current via the tube.The graph shows the following observations: The graph shows the dependence of the electric current that flows out of the anode and the electric potential present between the cathode and the grid. Also, the explanation of the experiment took place in terms of elastic and inelastic collisions between the electrons and the atoms of mercury. Moreover, the electric potential of an anode is slightly negative in comparison to the grid so that the electrons have the same kinetic energy as in the grid. The measurement of the electric current in the experiment is the result of the movement of the electrons from the grid to the anode. Furthermore, to draw emitted electrons, the voltage of the gird is positive with respect to the cathode. Three electrodes that are fitted include an electron-emitting hot cathode, a metal mesh grid, and an anode. Also, the fitting of the tube takes place with three electrodes. Furthermore, the drop of mercury was of the vapour pressure of 100 Pa. The original experiment made use of a heated vacuum tube of temperature 115 ☌. Another of his discoveries was the photoelectric effect.The aim of the Frank-Hertz Experiment procedure is to demonstrate the concept of quantisation of the energy levels in accordance with the Bohr’s model of an atom. He found that nonconductors allow most of the waves to pass through. Hertz also noted that electrical conductors reflect the waves and that they can be focused by concave reflectors. This occurred when Hertz turned on the oscillator, producing the first transmission and reception of electromagnetic waves. The receiver was placed several yards from the oscillator.Īccording to theory, if electromagnetic waves were spreading from the oscillator sparks, they would induce a current in the loop that would send sparks across the gap. At the ends of the loop were small knobs separated by a tiny gap. ![]() To confirm this, Hertz made a simple receiver of looped wire. Hertz reasoned that, if Maxwell’s predictions were correct, electromagnetic waves would be transmitted during each series of sparks. He used an oscillator made of polished brass knobs, each connected to an induction coil and separated by a tiny gap over which sparks could leap. In 1887 Hertz designed a brilliant set of experiments tested Maxwell’s hypothesis. In 1883 Hertz became a lecturer in theoretical physics at the University of Kiel and two years later he was appointed professor of physics at Karlsruhe Polytechnic. James Clerk Maxwell’s mathematical theory of 1873 had predicted that electromagnetic disturbances should propagate through space at the speed of light and should exhibit the wave-like characteristics of light propagation. In the 1880s many were seeking experimental evidence to establish the equivalence of light and electromagnetic propagation. ![]() ![]() See the excellent reference Heinrich Rudolf Hertz. Heinrich Hertz’s Wireless Experiment (1887) Taken from the following HARVARD EDU LINKS ![]()
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