In a thermos flask, heat loss by radiation is minimizes by the
A
silvered surfaces
B
vacuum within the doubled walls
C
plastic stopper
D
cork support
Verified Correct Answer: A.
Physical Principles & Numerical Solution
The silvered wall prevents heat loss by radiation. Silver is a poor radiator, and any heat from one wall tends to be reflected back by the other.
Source: Myschool Past Questions Archive (Record #35299)