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  1. Which of the following statements is correct?
  2. The radius of a nucleus of mass number A is directly proportional to
  3. By sucking through a straw, a student can reduce the pressure of his lungs
  4. In electromagnetic spectrum, the frequencies of γ-rays and x-rays and ultraviolet rays
  5. When ₃Li⁷ nuclei are bombarded by protons, and the resultant nuclei are ₄Be⁸,