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  1. The approxiamate ratio of nuclear mass densities of ₇₉Au¹⁹⁷ and ₄₇ Ag¹⁰⁷ nuclei is
  2. The escape velocity from the earth’s surface is 11 kms⁻¹.A certain planet
  3. 24 cells of emf 1.5 V each having internal resistance of 1 ohm are connected
  4. In Young’s experiment, the ratio of maximum to minimum intensities of the fringe
  5. Radioactivity of a sample at T₁ time is R₁ and at time T₂ is R₂. If half-life