Figure 9 shows a cathode ray tube in which a beam of electrons is cast on the screen.

      

Figure 9 shows a cathode ray tube in which a beam of electrons is cast on the screen.
physics652017824.jpg
(i) State how electrons are produced in the tube.
(ii) state how electron beam is detected.
(iii) State the reason for having a variable potential difference (p.d) at the: (I) grid (II) anodes

  

Answers


John
(i) Thermionic emission i.e. the filament heats up the cathode.

(ii) A spot is seen on the screen

(iii) (I) To focus the electrons towards the screen

(II) To accelerate the electrons towards the screen
johnmulu answered the question on June 6, 2017 at 05:28


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