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  1. 540 g of ice at 0° C is mixed with 540 g of water at 80° C. The final temperature
  2. The mean distance between the atoms of iron is 3 x 10⁻¹⁰ m and interatomic force
  3. If a nucleus ᴢXᴬ emits 9α and 5β-particles, then the ratio of total protons and neutrons
  4. In Young’s double slit interference experiment, using two coherent waves
  5. The half life of radium is 1620 yr and its atomic weight is 226 kg per kilo mol.