ELECTRON TUBES

•  Record the characteristic for a thermionic diode at different cathode heater voltage •  Identify the space charge and saturation regions •  Confirm the Schottky-Langmuir law In a thermionic ... more

At sufficiently high positive voltage between the cathode and anode (anode voltage), free electrons from the cathode can pass through the grid to reach the anode. The anode current generated in this way can be modulated by varying another ... more

•  Linear propagation of cathode rays / of electron beams •  Electrostatic charging effects •  Electron deflection by a magnetic field Straight-line propagation of electrons in the absence of ... more

•  Introduction to electron optics Cathode rays and deflecting fields can be used to magnify shadow images in a manner analogous to an optical lens system. With the help of this supplement, the experiment: Maltese-Cross ... more

•  Observing the thermionic emission of charge-carriers from a heated cathode. •  Determining the polarity of the emitted charge-carriers. •  Estimating the specific charge (chargeto-mass ratio) of ... more

•  Investigate the deflection of an electron beam by a magnetic field. •  Investigate the deflection of an electron beam by an electric field. •  Construct a velocity filter using orthogonal electric ... more

Electrons in a fine-beam tube are deflected into a circular path by a uniform magnetic field. The tube contains neon gas at a precisely defined pressure so that gas atoms become ionised by collision with electrons along the path thus ... more

•  Investigating the deflection of an electron beam in an electric field. •  Investigating the deflection of an electron beam in a magnetic field. •  Calibrating the frequency control of the sawtooth ... more

In the experiment, two identical current-carrying coils are placed outside the Braun tube, and the deflection of the electron beam in the magnetic fields of the coils is observed on the tube’s fluorescent screen as shifts of the ... more