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  1. At what temperature will the rms speed of air molecules be double that of NTP?
  2. If a nucleus ᴢXᴬ emits 9α and 5β-particles, then the ratio of total protons and neutrons
  3. The rest energy of an electron is
  4. An object is 8 cm high. It is desired to form a real image 4 cm high at 60 cm from
  5. The work function of metals is in the range of 2 eV to 5 eV.