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  1. Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV.
  2. If Q, E and W denote respectively the heat added, change in internal energy
  3. Surface tension of a solution is 30 x 10⁻² N/m. The radius of the soap bubble is 5 cm
  4. Laser light is considered to be coherant because it consists of
  5. When volume of a system is increased two times and temperature is decreased