A polished metallic piece and a black painted wooden piece are kept in open in bright sun for a long time.

Options

A. the wooden piece will absorb less heat than the metallic piece
B. the wooden piece will have a lower temperature than the metallic piece
C. if touched, the metallic piece will be felt hotter than the wooden piece
D. when the two pieces are removed from the open to a cold room, the wooden piece will lose heat at a faster rate than the metallic piece

Answer

C, D

Explanation

From metallic piece, more heat is conducted into the body than from a wooden piece. So, alternative (c ). Is correct. Wooden piece will act as a black body. It will absorb more heat as compared to a polished metallic piece when placed in open in bright sun. Now according to Kirchhoff's law, as a good absorber is also a good emitter, hence, wooden piece will lose heat at a faster rate than the metallic piece.