Is it possible to cool anything to a temperature below 0 degrees Kelvin? yes, al

Question

Is it possible to cool anything to a temperature below 0 degrees Kelvin?
yes, always, that’s what negative temperatures mean
yes, but only in certain special circumstances
no, never
usually not

Suppose a sample of gas does work on its surroundings without any heat being added or lost by the gas. In this situation:
the gas will get warmer (internal energy increases)
the gas will get cooler (internal energy decreases)
the gas will stay the same temperature (internal energy stays constant)
the gas temperature will fluctuate (internal energy fluctuates)

Explanation / Answer

a) as the starting value of absolute scale measurement starts from 0K. thus it is not possible to cool anything to a temperature below 0 degrees Kelvin hence option c is correct b) The equation for first law of thermodynamics is dQ=dU+dW in the present case any heat being not added or lost by the gas thus dQ=0 hence dU=-dW negative sign indicates that internal energy decreases thus the gas will get cooler hence option b is correct

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