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  1. In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series
  2. A body is thrown vertically upward in air when air resistance is taken into account
  3. The radius of the convex surface of a plano-convex lens is 20 cm and the refractive index
  4. The phenomenon of radioactivity
  5. When 10¹⁹elecrons are removed from a neutral metal plate through some process,