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  1. A light of wavelength 5000Å falls on a sensitive plate with photoelectric work
  2. Excitation energy of a hydrogen like ion, in its first excitation state, is 40.8 eV.
  3. Amout of heat required to raise the temperature of a body through 1 K is called its
  4. When an α-particle of mass m moving with velocity ν bombards on a heavy nucleus
  5. what should be the velocity of an electron so that its momentum becomes equal