The grid in the cathode ray oscilloscope _.
Correct answer: B. Controls the brightness of the spot formed
- A. Controls the number of waves
- B. Controls the brightness of the spot formed
- C. Accelerates electrons
- D. Has positive potential with respect to the cathode
Explanation
The correct answer is B: The grid in a cathode ray oscilloscope controls the brightness of the spot formed on the screen. This is because the grid modulates the intensity of the electron beam, thereby affecting the brightness. Option A is incorrect because the grid does not control the number of waves. Option C is incorrect because electron acceleration is the role of the anodes. Option D is incorrect because the grid is at a negative potential compared to the cathode, which helps in controlling the flow of electrons.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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