The graph shown in fig. represents the variation of temperature 7 of two bodies x and y having same surface area with time t due to the emission of radiation. The correct relation between the emissivity and absorptivity power of two bodies is

 

• A

  ${\mathrm{E}}_{\mathrm{x}}>{\mathrm{E}}_{\mathrm{y}}\text{ and }{\mathrm{a}}_{\mathrm{x}}<{\mathrm{a}}_{\mathrm{y}}$

• B

  ${\mathrm{E}}_{\mathrm{x}}<{\mathrm{E}}_{\mathrm{y}}\text{ and }{\mathrm{a}}_{\mathrm{x}}>{\mathrm{a}}_{\mathrm{y}}$

• C

  ${\mathrm{E}}_{\mathrm{x}}>{\mathrm{E}}_{\mathrm{y}}\text{ and }{\mathrm{a}}_{\mathrm{x}}>{\mathrm{a}}_{\mathrm{y}}$

• D

  ${\mathrm{E}}_{\mathrm{x}}<{\mathrm{E}}_{\mathrm{y}}\text{ and }{\mathrm{a}}_{\mathrm{x}}<{\mathrm{a}}_{\mathrm{y}}$