Approximately one hydrogen atom per cubic meter is present in interstellar space. Assuming that the H - atom… · ABC26PH0451

Subject: Physical Chemistry · Chapter: Gaseous State · Topic: Gaseous State – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Medium

Approximately one hydrogen atom per cubic meter is present in interstellar space. Assuming that the H - atom has a diameter of $10^{-10} \mathrm{m}$, the mean free path (m) approximately is

(a)$10^{10}$

(b)$10^{19}$

(c)$10^{24}$

(d)$10^{14}$

Answer

Answer: B ✓ checked by 4AB · confidence high

Explanation

λ = 1/(√2πd²n) = 1/(1.414 × 3.14 × 10⁻²⁰ × 1) ≈ 2×10¹⁹ m (b).

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