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Of the radiant energy 350W/m2 incident upon a surface 250W/m2 is absorbed, 60W/m2 is reflected and the remainder is transmitted through the surface. Workout the value for absorptivity for the surface material
  • a)
    0.123
  • b)
    0.714
  • c)
    0.684
  • d)
    0.386
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Of the radiant energy 350W/m2incident upon a surface 250W/m2is absorbe...
Absorptivity = 250/350 = 0.714.
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Of the radiant energy 350W/m2incident upon a surface 250W/m2is absorbe...
Calculating Absorptivity
To calculate the absorptivity of the surface material, we first need to understand the concept of absorptivity. Absorptivity is a measure of how well a material absorbs radiant energy. It is defined as the ratio of the absorbed radiant energy to the incident radiant energy on a surface.

Given Data
- Incident radiant energy = 350 W/m2
- Absorbed radiant energy = 250 W/m2

Calculations
Absorbed radiant energy = Absorptivity x Incident radiant energy
250 = Absorptivity x 350
Absorptivity = 250 / 350
Absorptivity = 0.714
Therefore, the absorptivity of the surface material is 0.714, which corresponds to option B. This means that the surface material absorbs about 71.4% of the incident radiant energy.
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Of the radiant energy 350W/m2incident upon a surface 250W/m2is absorbed, 60W/m2is reflected and the remainder is transmitted through the surface. Workout the value for absorptivity for the surface materiala)0.123b)0.714c)0.684d)0.386Correct answer is option 'B'. Can you explain this answer?
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