Question:
What determines the light intensity in a CRT?
What determines the light intensity in a CRT?
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In CRTs, \textbf{higher electron momentum} means more energy transfer to the screen, producing \textbf{brighter spots of light}.
Updated On: Jun 24, 2025
- Voltage
- Current
- Screen
- Momentum of electrons
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The Correct Option is D
Solution and Explanation
A Cathode Ray Tube (CRT) functions by emitting a stream of electrons from an electron gun toward a phosphorescent screen.
When these electrons strike the screen, they excite the phosphor coating, producing visible light.
The intensity of the light emitted is directly related to the kinetic energy of the electrons when they strike the screen.
This kinetic energy depends on the momentum of the electrons, which in turn is governed by their velocity and mass.
Electrons are accelerated by a high voltage, and their momentum is what determines how strongly they impact the screen and how bright the emitted light is.
Thus, the correct factor that determines light intensity in a CRT is the momentum of electrons.
When these electrons strike the screen, they excite the phosphor coating, producing visible light.
The intensity of the light emitted is directly related to the kinetic energy of the electrons when they strike the screen.
This kinetic energy depends on the momentum of the electrons, which in turn is governed by their velocity and mass.
Electrons are accelerated by a high voltage, and their momentum is what determines how strongly they impact the screen and how bright the emitted light is.
Thus, the correct factor that determines light intensity in a CRT is the momentum of electrons.
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