Answer:
Weber's law
Explanation:
According to Weber, the psychologists proposed that for each of our five senses, the degree of change in the stimulus that is required to product a just noticeable difference is reliant on the degree of intensity of the first presented stimulus. In other word, the change in a stimulus that will be just noticeable is constant with its first or original stimulus.
The conversational maxim that the professor violates is the relation. It is because professor discusses topics that are not related to the topic that she is going to discuss, which is why she is violating the relation. She focus her attention of discussing events that is happening on her life rather than focusing on teaching the topic that she should be teaching such as the tangents.
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upper Mississippi river is the answer