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Q.

When cathode rays strike a metal target of high melting point with a very high velocity, then which of the following are produced?

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a

gamma rays

b

ultrasonic rays

c

α-rays

d

X-rays

answer is C.

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Detailed Solution

  • When cathode rays strike a metal target of high melting point with a very high velocity, then X-rays  are produced.
  • When cathode rays (electrons, having high velocity) strike a metal target of high melting point , they knock out inner electrons of the atoms of the target material. 
  • To fill up this vacancy, electrons from higher energy level make transition to lower level resulting in emission of radiation. 
  • If target material has very high atomic number, then the emitted radiation is X-ray.
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