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  1. The threshold frequency for a certain photosensitive metal is ν₀. When it is illuminated
  2. In an orbital motion, the angular momentum vector is
  3. The mean distance between the atoms of iron is 3 x 10⁻¹⁰ m and interatomic force
  4. The potential energy of a system increases if work is done
  5. The refractive index of water, glass and diamond are 1.33, 1.50, 2.40 respectively