1. alpha-rays
  2. beta and gamma rays
  3. X-rays
  4. Positive rays
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1 Answers

Answer: Option 3

When cathode rays strike a solid target of high atomic weight and high melting point such as tungsten, molybdenum, etc, they give rise to a highly penetrating radiation called the X-rays (LIT Physics by Dr. P.K Agarwal).

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