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(A) Cathode rays consist of high-speed electrons. When these high-energy electrons strike a metal target with a high melting point (such as tungsten o

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$X$-rays are produced

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(A) Cathode rays consist of high-speed electrons. When these high-energy electrons strike a metal target with a high melting point (such as tungsten or molybdenum),they are suddenly decelerated by the strong electric fields of the target nuclei. This rapid deceleration causes the emission of high-energy electromagnetic radiation known as $X$-rays. This is the fundamental principle behind the operation of an $X$-ray tube.

When cathode rays strike a metal target of high melting point with very high velocity,then

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