The vacuum and silvered wall surfaces of a vacuum flask walls are respectively
A
minimize conduction and convection and prevent radiation
B
prevent conduction and convection and minimize radiation
C
prevent conduction and minimize convection and radiation
D
minimize convection and prevent conduction and radiation
Verified Correct Answer: B.
Physical Principles & Numerical Solution
Vacuum: It prevents conduction and convection because there are no air molecules to transfer heat.
Silvered Walls: They minimize radiation by reflecting thermal radiation back.
Source: WAEC / JAMB / NECO Classroom Archive (Record #72005)