The graph, shown in the adjacement diagram, represents the variation of temperature (T) of two bodies, x and y having same surface area, with time (t) due to the emissions of radiation. Find the correct relation b etween the emissivity (e) and absorpitivity (a) of two bodies

Options

A. `E_(x) gt E_(y)` and `a_(x) lt a_(y)`
B. `E_(x) lt E_(y)` and `a_(x) gt a_(y)`
C. `E_(x) gt E_(y)` and `a_(x) gt a_(y)`
D. `E_(x) lt E_(y)` and `a_(x) lt a_(y)`

Answer

C

Explanation

The graph shows that for the same temperature difference `(T_(2)-T_(1))` , less time is taken for `x` . This means the emissivity is more for `x` . According to Kirchhoff's law, a good emitter is a good absorber as well.