A small metal block initially at is dropped into a large reservoir of water at and…

PHYSICS · Single correct · A Level · Physics · Engineering physics · Engineering physics

Problem

A small metal block initially at

400\,\text{K}

is dropped into a large reservoir of water at

300\,\text{K}

and allowed to reach thermal equilibrium at

300\,\text{K}

. Which option correctly states the sign of the total entropy change of the universe for this process? (a)

\Delta S_{\text{univ}}=0

(b)

\Delta S_{\text{univ}}<0

(c)

\Delta S_{\text{univ}}>0

(d) The sign of

\Delta S_{\text{univ}}

cannot be determined without knowing the masses.