Physics

Problem

An insulated box contains

3.0\times10^{23}

helium atoms, which are cooled by

40\,\text{K}

. What is the change in internal energy of the gas? a)

-4.1\times10^{2}\,\text{J}

+2.5\times10^{2}\,\text{J}

-2.5\times10^{2}\,\text{J}

-1.7\times10^{2}\,\text{J}