How Do Electrons Impact Screen Pressure in Televisions?

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SUMMARY

The discussion centers on calculating the pressure exerted by electrons striking a television screen. Electrons travel at a speed of 7.31 x 107 m/s and have a mass of 9.11 x 10-31 kg, with a total of 7.97 x 1016 electrons impacting an area of 2.15 x 10-7 m2 per second. The pressure can be determined using the formula P = F/A, where force is derived from the momentum change of the electrons. This analysis provides a clear method for calculating the pressure based on the given parameters.

PREREQUISITES
  • Understanding of basic physics concepts such as force, pressure, and momentum.
  • Familiarity with the equations F = m*a and P = F/A.
  • Knowledge of electron properties, including mass and velocity.
  • Basic mathematical skills for calculations involving scientific notation.
NEXT STEPS
  • Calculate the total force exerted by the electrons using the momentum formula.
  • Explore the relationship between electron velocity and pressure in different materials.
  • Investigate how varying the area of impact affects pressure calculations.
  • Learn about the implications of electron pressure in other applications, such as cathode ray tubes.
USEFUL FOR

Physics students, electrical engineers, and professionals involved in television technology or materials science will benefit from this discussion.

moeraeleizhaj
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In a TV, electrons with a speed of 7.31 x 107 m/s strike the screen from behind, causing it to glow. The electrons come to a halt after striking the screen. Each electron has a mass of 9.11 x 10-31 kg, and there are 7.97 x 1016 electrons per second hitting the screen over an area of 2.15 x 10-7 m2. What is the pressure that the electrons exert on the screen?

Hi, can anyone help me please? I really don't know how to start this question. It confuses me a lot.
 
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Force is F=m*a. And Pressure is F/A where A is area.

Force is also dP/dt where P is momentum mv.

Now you know what the rate of momentum the screen is absorbing by the m*v of the total number of electrons in the stream of electrons in a second. And you know the area over which they want the Pressure.
 

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