Which of the following gas has smaller e/m value when it produces positive rays?
Correct answer: D. Carbon monoxide
- A. Oxygen
- B. Nitrogen
- C. Methane
- D. Carbon monoxide
Explanation
To determine the gas with the smallest e/m (charge-to-mass) value when producing positive rays, we can calculate the e/m values by comparing the atomic masses. For oxygen:e/m = (2e) / (2 * 15.999 u) ≈ 0.125 e/m For nitrogen:e/m = (2e) / (2 * 14.007 u) ≈ 0.142 e/m For methane:e/m = (1e) / (12.011 u + 4 * 1.008 u) ≈ 0.066 e/m For carbon monoxide:e/m = (1e) / (12.011 u + 15.999 u) ≈ 0.035 e/m Among the gases provided, carbon monoxide (CO) has the smallest e/m value when producing positive rays.
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