Physics · Semiconductors, semiconductor diode: I-V characteristics in forward and reverse bias, diode as a rectifier
How can the brightness of the pattern on the screen of cathode ray tube be chang
How can the brightness of the pattern on the screen of cathode ray tube be changed?
- A. Changing the target
- B. By changing the current on gridd
- C. By changing the negative potential on gridd
- D. can't be changed
Step-by-step solution
In a cathode ray tube, the brightness of the pattern is controlled by the intensity of the electron beam. This is achieved by varying the negative potential on the control grid: a more negative grid voltage repels more electrons, reducing beam current and dimming the spot, while a less negative voltage allows more electrons to pass, increasing brightness.