Question

The temperature at which molecular energy is minimum on Kelvin temperature scale is called:

• A. Absolute Zero Temperature
• B. Zero Energy Temperature
• C. Absolute Temperature
• D. None of These

Answer 1

Answer: (A)

Absolute Zero Temperature

The temperature at which molecular energy is minimum on Kelvin temperature scale is called Absolute zero temperature . It is the minimum possible temperature , which corresponds to $-{273.15}^{o}C$ or $0K$.At absolute zero temperature , the $v_{rms}$ of molecules becomes zero , as $v_{rms}\propto \sqrt{T}$. Hence , molecules have only potential energy due to this molecular energy (K+U) becomes minimum .