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  1. Which scientist experimentally proved the existence of electromagnetic waves?
  2. The kinetic energy of α-particle emitted in the α-dacay of ₈₈Ra²²⁶ is
  3. Which of the following pairs is wrong
  4. The ratio of minimum wavelengths of Lyman and Balmer series will be
  5. A Galilean telescope has an objective of focal length 100 cm and magnifying power 50