If the air inside a rigid box is heated, the i, average speed of the molecules increases ii. pressure of the air increases iii. average separation of the molecule increases. Which of the statements above are correct?
A
i and ii only
B
ii and iii only
C
i and iii only
D
i, ii and iii
Verified Correct Answer: A.
Physical Principles & Numerical Solution
When air in a rigid box is heated, the molecules move faster, causing more forceful collisions with the walls and hence increasing the pressure. Since the box cannot expand, the average separation remains unchanged.
Source: Myschool Past Questions Archive (Record #34958)