Absolute zero temperature signifies the

Solution (By Examveda Team)

The correct answer is Option C: Temperature of the heat reservoir to which a Carnot engine rejects no heat.
Here's why:
Absolute zero is the lowest possible temperature, theoretically 0 Kelvin or -273.15 degrees Celsius.
It's important to understand how Carnot engines relate to temperature and heat rejection.
A Carnot engine is a theoretical engine that operates with the highest possible efficiency between two heat reservoirs (a hot one and a cold one).
Option A is partially correct. Absolute zero is the minimum temperature, but the options relates to engines making option C more relevant.
Option B states the carnot engine rejects *all* the heat. It could only do that at 0 kelvin.
The key is that a Carnot engine's efficiency depends on the temperature difference between the hot and cold reservoirs.
At absolute zero (0 Kelvin), the cold reservoir has no more energy to give, so the Carnot engine cannot reject any heat to it. This means the engine could theoretically convert all the heat from the hot reservoir into work.
Therefore, absolute zero signifies the temperature at which a Carnot engine rejects no heat.