Polymers often are: ______ A.Crystalline B.Non-crystalline . Vacancies within ma
ID: 494513 • Letter: P
Question
Polymers often are: ______
A.Crystalline
B.Non-crystalline .
Vacancies within materials are mostly related to: ______
A.Materials strengthening
B.Atomic diffusion
The production of vacancies is often a thermally activated process. Thus, an increase in temperature will lead to: ______
A.An increase in vacancy concentration
B.A decrease in vacancy concentration
A spacecraft in the outer space gains or loses thermal energy by: ______
A.Conduction
B.Convection
C.Radiation
Inside a spacecraft in the outer space, the following heat transfer mechanism is not active: ______
A.Conduction
B.Natural convection
C.Forced convection
D.Radiation
.
Explanation / Answer
1) polymers often are Non crystalline (or) Amorphous
2) Vacannies within the material due to the Atomic diffusion(Option B) . Diffusion process is due to the random thermally active movement of atoms in solids reslts vaccancy
3) The production of vacancies is dependent on temperature. If temperature increase , An increase in vacancy concentration. temperture increase the randomness increase that leads increase in vacancy conceration.
4) A Spacecraft in the outer space gains or loses thermal energy by Radiation
Inside a spacecraft in the outer space, the following heat transfer mechanism is not active: ______
C.Forced convection