Question

Which of the following is the best thermal insulator to reduce the transfer ofthermal energy by radiation?OA. GlassOB. A vacuumOC. AirOD. WoodSUBMIT

Answer 1

`A\text{ Vacuum}`

Step-by-step explanation:

Here, we want to select the best thermal insulator

An insulator is expected not to radiate heat energy

A vacuum is known not to contain ions

In a perfect state, with the absence of ions in it, it is the best thermal insulator

Thus, the correct answer choice here is A vacuum