Discussion
Consider the following statements about the onset of collection.
1. Collection is inefficient below about twenty micrometres radius.
2. Once past that size a collector grows increasingly rapidly.
3. Collection is efficient at every droplet size in a cloud.
Answer: B
The first two are correct and describe the runaway character of the process. The third ignores the collision efficiency threshold that governs when collection can begin at all. Below that size a drop sweeps almost nothing from its path.
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