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MMLU-Pro / 4481 / The concentration of hydrogen atoms in intergalactic space at a temper-ature of…

Problem

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question

The concentration of hydrogen atoms in intergalactic space at a temper-ature of 7.8 × 10^50K is about 1 atom per 100 liter. Assuming the col-lision diameter of the hydrogen atom is 2.0\AA calculate a) the mean free path of an atom in light-years. b) The approximate average time, in years, between collisions of a given atom.

category

chemistry

options

  1. mean free path is 59 light-yr and time between collisions is 1.382 × 10^5 yr
  2. mean free path is 60 light-yr and time between collisions is 1.4 × 10^5 yr
  3. mean free path is 70 light-yr and time between collisions is 1.6 × 10^5 yr
  4. mean free path is 40 light-yr and time between collisions is 0.9 × 10^5 yr
  5. mean free path is 80 light-yr and time between collisions is 1.8 × 10^5 yr
  6. mean free path is 50 light-yr and time between collisions is 1.2 × 10^5 yr
  7. mean free path is 75 light-yr and time between collisions is 1.7 × 10^5 yr
  8. mean free path is 55 light-yr and time between collisions is 1.3 × 10^5 yr
  9. mean free path is 45 light-yr and time between collisions is 1.0 × 10^5 yr
  10. mean free path is 65 light-yr and time between collisions is 1.5 × 10^5 yr

src

stemez-PhysicalChemistry

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