Question

Which of the following materials belongs to diathermanous substance?

Options

• Wood

• Iron

• Glass 

• Copper

Answer 1

Glass

Explanation:

A diathermanous substance is a material that allows thermal radiation (heat) to pass through it without significant absorption.

• Glass is diathermanous because it allows heat radiation to pass through, especially in the visible and infrared spectrum.
• Wood, iron, and copper are adiathermanous (they do not allow heat radiation to pass through easily; instead, they absorb or reflect it).