a student conducts an experiment to determine if ultraviolet light kills bacteria. his result do not support his hypothesis. we say that the hypothesis is

A hypothesis cannot be wrong, because it is an educated guess. You cannot prove a guess wrong. A guess is something you think, and there is no right or wrong answer to thoughts.

Rejected.

Explanation:

A hypothesis is tested by experimentation. Results of experiments decide if the hypothesis would be accepted or rejected.

According to the question, the results from the experiment carried out by student do not support his hypothesis. This means that the hypothesis is "rejected". If his results would have supported his hypothesis, it would have been "accepted".