Question

2
Select the correct answer
Which is true with respect to the kinetic energy of a molecule?
OA it is the lowest at low temperatures
OB. it increases at low temperatures
OC it is the same at all temperatures
OD. it is the lowest at high temperatures
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Ness

Answer 1

A

Ek = 1/2*m*V^2

Take ideal gas for example, the Vrms is (3RT/M)^1/2. Ek is proportional to T.

Therefore, Ek is the lower at the low temperature. Another perspective is the average kinetic energy. The average kinetic energy is equal to (3/2)RT, so the average kinetic energy is proportional to temperature.