A jar of gas is heated so its absolute temperature doubles. The average kinetic energy per molecule:
AStays the same, since each molecule keeps its mass
BQuadruples, since KE scales with velocity squared
CDoubles, since $\langle KE\rangle = \tfrac{3}{2}k_BT$
DHalves, since faster molecules collide more often only
Answer & Solution
Correct answer: C. Doubles, since $\langle KE\rangle = \tfrac{3}{2}k_BT$
$\langle KE\rangle \propto T$ in kelvin; doubling $T$ doubles average KE.
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