The correct answer is option 3. This statement is incorrect because the surface of the inner wall of a thermos flask does not radiate a good amount of heat. In fact, one of the main features of a thermos flask is that it minimizes heat transfer through radiation.

Let`s analyze each option to better understand why option 3 is incorrect:

Option 1 states that the walls of the flask are separated by a vacuum and made of glass, which is a poor conductor of heat. This is correct. The vacuum between the walls prevents conduction and convection, while the glass walls minimize heat transfer through conduction.

Option 2 states that the glass walls themselves have shiny surfaces. This is also correct. The shiny surfaces help to reflect radiant heat back into the flask, reducing heat transfer through radiation.

Option 3, the incorrect statement, claims that the surface of the inner wall radiates a good amount of heat, and the surface of the outer wall absorbs some of this heat. However, in a properly functioning thermos flask, the inner wall should not radiate heat significantly. The vacuum and reflective surfaces are designed to minimize radiation.

Option 4 states that the cork supports are poor conductors of heat. This is correct. The cork material used for