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  1. Source S₁ is producing, 10¹⁵ photons per second of wavelength 5000Å
  2. Two radioactive materials X₁ and X₂ have decay constants 5λ and λ respectively
  3. Pure Si at 300 k has equal electrons (nₑ) and hole (nh) concentrations
  4. In Raman effect, Stoke’s lines are spectral lines having
  5. An object of mass 3kg is at rest. Now a force F=6t² i⃗+4t j⃗ is applied on the object