SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In a vacuum tube, the high voltage across anode and cathode used to
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control the fialament temperature
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control the number of electrons
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produce narrow beam electrons
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accelerate electrons with a high speed
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Explanation:
Detailed explanation-1: -The anode is used to accelerate the electrons towards the screen and also collects the secondary electrons that are emitted by the phosphor particles in the vacuum of the CRT.
Detailed explanation-2: -In the cathode ray tube, electrons are ejected from the cathode and accelerated through a voltage, gaining some 600 km/s for every volt they are accelerated through. Some of these fast-moving electrons crash into the gas inside the tube, causing it to glow, which allows us to see the path of the beam.
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