For a perfect black body, the absorptive power is
Question and options
For a perfect black body, the absorptive power is
- 0
- 1
- 0.5
Answer and explanation
Correct answer: C - 1
A perfect black body absorbs all radiation falling on it, whatever the wavelength, and reflects or transmits none, so its absorptive power (absorptivity) is 1. A value of 0 would describe a perfect reflector, and absorptive power, being a fraction of incident energy, cannot be infinite.
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