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  1. A particle of mass ‘m’ is kept at rest at a height 3R from the surface of earth
  2. To obtain a p-type semiconductor, germanium must be doped with
  3. A proton of mass 1.6×10⁻²⁷ kg goes round in a circular orbit of radius 0.10 m under
  4. The energy of groundstate (n=1) of hydrogen level is -13.6 eV. The ionistation
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