For a perfectly black body, its absorptive power is | PGMN Solutions

For a perfectly black body, its absorptive power is
(A) 1
(B) 0.5
(C) 0.8
(D) 2



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🚀 Step-by-Step Solution to Solve This Question 🚀
📌 Chapter: Kinetic Theory of Gases and Radiation
📌 Topic: Black Body and Absorptive Power

🔹 Step 1: Introduce the core concept related to the question
In thermal radiation, the absorptive power of a body refers to its ability to absorb the incident radiation that falls on it.

🔹 Step 2: Explain how the concept applies to the given situation
A perfectly black body is an idealized physical body that absorbs all the radiation incident on it without reflecting or transmitting any part of it.

🔹 Step 3: Break down the logical steps required to solve the problem
Since a black body does not allow any radiation to escape (no reflection or transmission), the amount of absorbed radiation is equal to the total incident radiation.

🔹 Step 4: Explain the final theoretical conclusion
Because the black body absorbs 100% of the incident radiation, its absorptive power is maximum, which is defined as 1 on a scale from 0 to 1.

✅ Final Answer: (A) 1 🚀

🔥 Pro Tip: Always remember — a perfectly black body is a perfect absorber and perfect emitter of radiation, making it a key reference point in the study of thermal radiation


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