Greenhouse principle — what do we call a “body” or enclosure that admits short-wavelength incoming solar radiation but restricts the escape of long-wavelength outgoing infrared radiation, thereby trapping heat?

Introduction:
The greenhouse principle describes selective transmission of radiation: sunlight (short wavelength) enters easily, while thermal infrared (long wavelength) is impeded from escaping. The question asks for the term applied to such a “body” or enclosure.

Given Data / Assumptions:

• Incoming radiation: predominantly short-wave solar.
• Outgoing radiation: long-wave infrared emitted by warmed surfaces.
• Enclosure: allows in short-wave, blocks or reduces outgoing long-wave.

Concept / Approach:
A greenhouse (e.g., glasshouse) uses glazing that is transparent to solar radiation but relatively opaque to thermal IR. This raises interior temperature compared with ambient conditions.

Step-by-Step Solution:

Verification / Alternative check:
In environmental engineering and climatology teaching, the “greenhouse effect” explains how glazing and certain atmospheric gases trap heat by limiting IR escape while admitting sunlight.

Why Other Options Are Wrong:

• Global warming: a broader climatic trend, not the specific enclosure.
• Atmospheric effect: too vague; lacks the specific selective transmission meaning.
• Ionosphere: a high-altitude plasma layer affecting radio waves, unrelated to heat trapping via IR.

Common Pitfalls:
Confusing the physical greenhouse with the atmospheric greenhouse effect; the atmosphere also traps heat, but mechanisms (e.g., convection dynamics) add complexity.

Final Answer:
Green house is the correct term for such an enclosure.