A black body emissive power is 81 J/m2 sec it is at 300 K another one ordinary body emissivity is 0.8 it is at 500 K then what is the emissive power of ordinary body?

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A black body emissive power is 81 J/m² sec it is at 300 K another one ordinary body emissivity is 0.8 it is at 500 K then what is the emissive power of ordinary body?

200 J/m²sec

300 J/m² sec

400 J/m² sec

500 J/m² sec

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