Electron beam of a computer monitor

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SUMMARY

The current in the electron beam of a computer monitor is 410 µA, which translates to 410 µC of charge hitting the screen per second. To calculate the number of electrons per second, the equation used is (410e-6C)/(1.6×10-19C/e), resulting in approximately 2.56 x 1015 electrons per second. The initial miscalculation stemmed from incorrect exponent handling, which was clarified during the discussion. Understanding exponent rules is crucial for accurate calculations in physics problems.

PREREQUISITES
  • Basic understanding of electric current and charge
  • Familiarity with the concept of electrons and their charge (1.6 x 10-19 C)
  • Knowledge of exponent rules for mathematical calculations
  • Experience with unit conversions in physics
NEXT STEPS
  • Review calculations involving electric current and charge
  • Study the principles of electron flow in conductive materials
  • Learn about the role of electron beams in computer monitors
  • Explore advanced topics in electromagnetism and particle physics
USEFUL FOR

Students studying physics, particularly those focusing on electromagnetism, as well as educators and anyone interested in the workings of computer monitors and electron behavior.

JJones_86
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Homework Statement


The current in the electron beam of a computer monitor is 410 µA. How many electrons per second hit the screen?


Homework Equations





The Attempt at a Solution


A beam current of 410µA means that 410µC of charge strike the screen per second. This is equivalent to (410e-6C)/(1.6×10-19C/e) = 6.56e-23 electrons...

But it's telling me that it's the wrong answer, any help is appreciated!
 
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I don't think you mean 10-23electrons
410 x10-6 / 1.6 x10-19 = 410/1.6 x10-6 - -19 = 250 x10-6 +19 = 250 x10+13

It's worth knowing the rules for doing calculations with exponents so you can estimate the answer before entering the numbers in a calculator
 
Last edited:
Oops, calculator error, thanks!
 

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