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  1. In Bohr model of hydrogen atom, the force on the electron depends on the principal
  2. The ratio of minimum wavelengths of Lyman and Balmer series will be
  3. In an NPN transistor the collector current is 24 mA. If 80% of the electrons
  4. Two cities are 150 km apart. Electric power is sent from one city to another city
  5. The energy of the em waves is of the order of 15 keV. To which part of the spectrum