A) \[{{E}_{X}}>{{E}_{y}}\]and \[{{a}_{X}}<{{a}_{y}}\]
B) \[{{E}_{X}}<{{E}_{y}}\]and \[{{a}_{X}}>{{a}_{y}}\]
C) \[{{E}_{X}}>{{E}_{y}}\]and \[{{a}_{X}}<{{a}_{y}}\]
D) \[{{E}_{X}}<{{E}_{y}}\]and \[{{a}_{X}}<{{a}_{y}}\]
Correct Answer: C
Solution :
Emissivity (e) \[\propto \] Rate of cooling \[\left( -\frac{dT}{dt} \right)\] The graph shows \[\left( -\frac{dT}{dt} \right)\,>{{\left( \frac{dT}{dt} \right)}_{y}}\] Emissivity (e) \[\propto \] absorptive power So, \[{{a}_{x}}>{{a}_{y}}\]
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