8. what subfield of physics could describe small objects traveling at high speeds or experiencing a strong…

Brief Explanations:

The general theory of relativity deals with gravity and describes phenomena in strong gravitational fields. Special - relativity is about objects moving at high speeds relative to an observer. Classical physics is not suitable for high - speed or strong - gravitational - field scenarios for small objects. There is no such well - known subfield as "quantum relativity" in the traditional sense. For small objects traveling at high speeds or in strong gravitational fields, the general theory of relativity is applicable as it combines gravity with the principles of relativity.

Answer:

a. general theory of relativity