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  1. Excitation energy of a hydrogen like ion, in its first excitation state, is 40.8 eV.
  2. A point source is kept at a distnace 1000m has an illumination I. To change the illumination
  3. A car accelerates from rest at constant rate for first 10s and covers a distance x.
  4. Two strings A and B, made of same material are stretched by same tension
  5. The loudness and pitch of a sound note depends on