Question

Which of the following is an ideal body to absorb all radiation incident on it without any reflection ?

• A. Black body
• B. White body
• C. Red body
• D. Brown body

Hint:

In the real world, black objects get hotter in the sun because they absorb more radiation. A "perfect" black body is the ultimate theoretical absorber.

Answer 1

The Correct Option is A

Step 1: Concept
In physics and remote sensing, materials are theoretically modeled based on how perfectly they interact with incoming electromagnetic radiation.

Step 2: Meaning
A theoretical object that is a perfect absorber of all incoming radiation, regardless of wavelength or angle of incidence, is needed for thermodynamic modeling.

Step 3: Analysis

• A white body theoretically reflects all incident radiation.
• Colored bodies (like red or brown) selectively absorb and reflect specific wavelengths of light.
• A black body is defined as an idealized physical body that absorbs all incident electromagnetic radiation, with zero reflection or transmission.

Step 4: Conclusion
The definition perfectly matches that of a black body. Final Answer: (A)