The correct answer is Option A.
Why This Option Is Correct?
When the temperature of an aluminum plate increases, the plate expands due to thermal expansion. Thermal expansion is the tendency of a material to expand or contract when exposed to changes in temperature. In the case of an aluminum plate, as it gets hotter, it expands.
Now, let's consider the circular hole in the aluminum plate. Since the plate expands uniformly, the size of the hole also increases. This means that the answer is option a: the size of the hole increases.
It's important to note that the expansion is uniform, so all parts of the hole will increase in size proportionally. Option d, which suggests that only the top half of the hole increases, is incorrect.
To summarize:
- When the temperature of an aluminum plate increases, it expands uniformly.
- The circular hole in the plate also increases in size due to the plate's expansion.
- Therefore, the correct answer is option a: the size of the hole increases