Identical solid metal spheres are heated to and then suspended in three different…

PHYSICS · Single correct · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

Identical solid metal spheres are heated to

150\,^{\circ}\!\text{C}

and then suspended in three different environments maintained at

20\,^{\circ}\!\text{C}

. I. A matte black sphere in still air II. A polished shiny sphere in still air III. A polished shiny sphere in air moving at

5\,\text{m\,s}^{-1}

Neglecting other differences, which ranking correctly orders the spheres by the rate at which they lose energy, from fastest to slowest? (a)

\displaystyle III > I > II

(b)

\displaystyle I > III > II

(c)

\displaystyle I > II > III

(d)

\displaystyle II > III > I