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Difficulty: MediumX-rays: Production, Properties, and Applications

In a standard Coolidge X-ray tube, more than 90% of the kinetic energy of the fast-moving electrons striking the target anode is converted directly into X-rays.

Answer: Answer

Answer

False
The assertion is false because X-ray generation is a highly inefficient physical process. Less than 1% of the kinetic energy possessed by the high-speed electrons striking the target is converted into X-radiation. More than 99% of the kinetic energy is converted into heat, necessitating target materials with very high melting points (such as tungsten) embeddded in copper blocks for rapid heat conduction.

Step-by-Step Solution

1
Examine the energy transformation process during X-ray generation in a Coolidge tube.
Accelerated electrons collide with the heavy metal target anode, undergoing inelastic scattering and atomic interactions.
Electrons lose kinetic energy rapidly upon impact with the target material.
2
Evaluate the energy conversion ratio between radiation and heat.
Only approximately 0.2% to 1% of the total electron kinetic energy produces X-ray radiation (both Bremsstrahlung and characteristic emissions). The remaining 99%+ is converted into heat.
Most electron impacts only excite outer electron shells and cause lattice vibrations (thermal agitation) rather than inner-shell ionization or violent retardation.

Key Concept

Efficiency of X-ray production and heat generation at the target anode
Estimated Time:45s
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Topics

X-rays: Production, Properties, and Applications

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