Question: What is the principle of relativity as proposed by Einstein?

Options:

1. The laws of physics are the same in all inertial frames of reference.
2. Energy and mass are interchangeable.
3. Light travels at different speeds in different mediums.
4. Time is absolute and does not change.

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 apply equally regardless of the observer\'s state of motion.