A student uses two identical beakers and covers the outside surface of one with dull black paper and the outside surface of the other with shiny foil. The student puts the same volume of water at 80

^{\circ}

C into both beakers and measures their temperatures for several minutes. The cooling curve graphs for each experiment are shown.

a temperature-time graph from 0 to 8 minutes with two cooling curves from 80°C: graph X falling more slowly to about 26°C, graph Y falling more quickly to about 20°C

Which graph is for the beaker covered in shiny foil and what is the reason for the different rates of cooling?

	graph for beaker with shiny foil	reason
A	X	shiny surfaces are better absorbers of infrared radiation
B	X	shiny surfaces are poorer emitters of infrared radiation
C	Y	shiny surfaces are better absorbers of infrared radiation
D	Y	shiny surfaces are poorer emitters of infrared radiation