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gleem

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The acceleration of the electrons due to the potential difference between the anode and cathode is insufficient to produce significant radiation.

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The acceleration of the electrons due to the potential difference between the anode and cathode is insufficient to produce significant radiation.

Totally awesome thanks, how can i do a fast estimation of why the accelaration due to the potential diference is insufficient?

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mfb

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gleem

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how can i do a fast estimation of why the accelaration due to the potential diference is insufficient?

Classically the rate of radiation emitted in an acceleration varies as the acceleration squared. In the case of a typical X-ray tube the anode cathode distance is a couple of centimeters while the distance it take an electron to decelerate in an anode say of Tungsten is a small fraction of a millimeter.

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Thanks a lot, could you put the formula?Classically the rate of radiation emitted in an acceleration varies as the acceleration squared. In the case of a typical X-ray tube the anode cathode distance is a couple of centimeters while the distance it take an electron to decelerate in an anode say of Tungsten is a small fraction of a millimeter.

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gleem

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could you put the formula

total radiated power = (2/3)(e

Where e is the electronic charge

c is the velocity of light

a is the acceleration

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Thanks a lot, where can i read about its deduction?total radiated power = (2/3)(e^{2}/c^{3})a^{2}in the Gaussian unit system.

Where e is the electronic charge

c is the velocity of light

a is the acceleration

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gleem

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Thanks a lot, where can i read about its deduction?

Google "Larmor formula"

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That would be all thanks, you are the best. Just to get all clear, could you explain why is the distance important here? Is it because the desaceleration/aceleration happen faster when distances are short so they have to be bigger? It doesnt matter one happens via bremstrahlung and the other happens for a potential diference?Classically the rate of radiation emitted in an acceleration varies as the acceleration squared. In the case of a typical X-ray tube the anode cathode distance is a couple of centimeters while the distance it take an electron to decelerate in an anode say of Tungsten is a small fraction of a millimeter.

- #11

mfb

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You can see the acceleration around an atom as potential difference as well - just with much higher field gradients. Well, quantum-mechanical effects can become relevant there, but let's ignore them for now.

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