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  1. Electrons with energy 80 keV are incident on the tungsten target of an X-ray tube.
  2. A man goes 10 m towards north, then 20m towards east, the displacement is
  3. When 10¹⁹elecrons are removed from a neutral metal plate through some process,
  4. A plumb line is suspended form a ceiling of a car moving with horizontal acceleration
  5. Two liquid drops having diameters of 1 cm and 1.5 cm. The ratio of excess