Question: What is the principle of relativity according to Einstein?

Options:

1. The laws of physics are the same in all inertial frames of reference.
2. Time is absolute and does not change.
3. Mass and energy are completely independent.
4. Gravity is a force that acts at a distance.

Correct Answer: The laws of physics are the same in all inertial frames of reference.

Solution:

Einstein\'s principle of relativity states that the laws of physics are invariant in all inertial frames of reference, meaning they hold true regardless of the observer\'s state of motion.