Answer:
CULTURE SHOCK.
Step-by-step explanation:
Culture shock is a state of psychological and physical disorientation a person experiences when one moves to a new environment different from one's own or when experiencing an unfamiliar way of life.
Culture shock is normal, usually unavoidable and doesn't reflect badly on one.
It includes the shock of a new environment, meeting new people, eating new foods, adapting to a new language, and also shock of being separated from the important people in one's life.
Therefore, the term that can be used to describe Jack's initial state of disorientation is CULTURE SHOCK.