Exam-style question
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Using the equation KE = (3/2)kT, calculate the average kinetic energy of a gas molecule at a temperature of 300 K. (Use k = 1.38 x 10^-23 J/K) Scenario focus: use ideal gas reasoning in a distinct A-Level Physics context and identify the relevant physical quantity before choosing the answer.
Model answer
What a good answer should say
- The average kinetic energy of the gas molecule is 6.21 x 10^-21 J.
Explanation
Why this works
The correct answer is The average kinetic energy of the gas molecule is 6.21 x 10^-21 J.. This option is correct for Thermal physics because it applies the ideal gas reasoning idea in the stem and keeps the relevant quantity, unit, and physical conclusion together.
The alternatives either use a neighbouring formula, omit a required variable, or describe a different physical situation.
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