#Cathode ray experiment video generator#

The case of the electron raises several interesting points about the discovery process. He was awarded the Nobel Prize for physics in 1906 for this work, and in 1908 he was knighted. In 1899, he measured the charge of the particles, and speculated on how they were assembled into atoms. In 1897 he reported that 'cathode rays' were actually negatively charged particles in motion he argued that the charged particles weighed much less than the lightest atom and were in fact constituents of atoms. For much of his career, Thomson worked on various aspects of the conduction of electricity through gases. Thomson was the Cavendish professor of Experimental Physics at Cambridge University and director of its Cavendish Laboratory from 1884 until 1919. Thomson, 1856-1940 see photo at American Institute of Physics) is widely recognized as the discoverer of the electron. This pulse turns on the sweep generator, initiating the sawtooth wave form.Discovery of the Electron: J. however The sweep trigger then generates a pulse coincident with a selected point in the cycle of the triggering signal. A portion of the signal in the vertical amplifier is impose to the sweep trigger as a triggering signal. Cathode Ray Oscilloscope CRO Operation:Ī simple block diagram of a oscilloscope is in Fig 3 In general, the instrument is operats in the manner The signal in display increases the amplitude by the vertical amplifier and impose to the verical deflection plates of the CRT. The horizontal deflection of the beam repeats periodically, the frequency of this periodicity is adjustable by external controls. When the voltage suddenly falls to zero, as at points (a) (b) (c), etc…., the end of each sweep – the beam flies back to its initial position. Application of one cycle of this voltage difference, which increases linearly with time, to the horizontal plates causes the beam which deflects linearly with time across the tube face.

#Cathode ray experiment video generator#

The voltage output of such a generator is that of a sawtooth wave as shown in Fig. The linear deflection or sweep of the beam horizontally is accomplish by use of a sweep generator that is incorporated in the oscilloscope circuitry. The signal impose to the vertical plates is thus displays on the screen as a function of time and The horizontal axis serves as a uniform time scale. In the most common use of the oscilloscope the signal is first amplifies and impose to the vertical (deflection) plates to deflect the beam vertically and at the same time a voltage which increases linearly with time is apply to the horizontal deflection plates thus cause the beam to deflect horizontally at a constant rate. This coversion of electron energy into light allows us to write with points or lines of light on an otherwise darkened screen. then Wherever the electron beam hits the screen, the phosphor excits and light emits from that point.

moreover The combination of these two deflections allows the beam to reach any portion of the fluorescent screen. The plates are thus refer to as the horizontal and vertical deflection plates. Between the electron gun and the fluorescent screen are two pair of metal plates – one orients to provide horizontal deflection of the beam and one pair oriented ot give vertical deflection to the beam.