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  1. A car of mass m starts from rest and accelerates so that the instantaneous
  2. In radioactive element, β-rays are emitted from
  3. The half life of a radioactive isotope ‘X’ is 20 years. It decays to another element Y
  4. If the radius of star is R and it acts as a black body, what would be the temperature
  5. Two radioactive materials X₁ and X₂ have decay constants 5λ and λ respectively