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  1. If a nucleus ᴢXᴬ emits 9α and 5β-particles, then the ratio of total protons and neutrons
  2. The physical quantity which does not have the same dimensions as the other three is
  3. The speed of light in media M₁ and M₂ are 1.5×10⁸ ms⁻¹ and 2×10⁸ ms⁻¹ respectively.
  4. The wavelength of Kα line in copper is 1.5Å. The ionisation energy of K electron in copper is
  5. What is the dimension of impedance?