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  1. The two ends of a rod of length L and a uniform cross-sectional area
  2. The work function of metals is in the range of 2 eV to 5 eV.
  3. A boy is trying to start a fire by focusing sunlight on a piece of paper using
  4. In a discharge tube ionization of enclosed gas is produced due to collisions between
  5. Sodium and copper have work function 2.3 eV and 4.5 eV respectively