After the results of an experiment, a scientist decides that a long-held scientific theory must be revised. The scientist modifies the theory and tells other scientists. Predict the scientists' reaction, and explain why they might react that way. Your

Other scientists will be surprised at him/her

Explanation:

Science is totally empirical in its approach to knowledge. Models and theories are proposed and revised based on the available mass of experimental evidence.

However, all scientific findings must go through a rigorous process of verification and replication by other scientists in other parts of the world before they become  widely accepted in the world of science.

The scientist ought not to have modified the existing theory based on his findings as an individual. His findings ought to go through rigorous verification because other extraneous factors that he may not have controlled adequately may have led to the results he obtained.

Other scientists will be surprised and disregard his claims about the long held scientific theory until his findings are satisfactorily verified by other scientists working in different parts of the world.