Cathode Ray Tube: Deflection on Screen with 480V & 36V, 960V & 18V

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Homework Help Overview

The discussion revolves around a problem involving a Cathode Ray Tube (CRT), specifically focusing on the relationship between accelerating and deflecting voltages and their effect on electron deflection on the screen.

Discussion Character

  • Exploratory, Conceptual clarification

Approaches and Questions Raised

  • Participants explore the proportional relationships between deflection voltage, electron velocity, and kinetic energy related to acceleration voltage. Some question how these factors interact to determine the deflection observed on the screen.

Discussion Status

Some hints regarding the relationships between the variables have been provided, but no explicit consensus or resolution has been reached. Participants are engaging with the concepts but have not yet formulated a complete approach to the problem.

Contextual Notes

There is an emphasis on understanding the underlying physics principles rather than simply applying formulas. The original poster has presented specific voltage values for analysis, but the discussion remains open-ended.

gillgill
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In a Cathode Ray Tube, the deflection on the screen is 2.4cm when the accelerating voltage is 480V, and the deflecting voltage is 36V. What deflection will you see on the screen if the accelerating voltage is 960V and the deflecting voltage is 18V?
 
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Some hints...The deflection is proportional to the deflection voltage. But it's inversely proportional to the velocity of the electron, since a faster electron spends less time between the deflection plates than a slower one. Finally, the kinetic energy of an electron is proportional to the acceleration voltage.
 
um...so...
 
gillgill said:
um...so...
I've given you everything you need to know to solve the problem. I'm certainly not going to solve it for you!
 

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