Question: What is the main idea behind Einstein\'s mass-energy equivalence?

Options:

1. Mass can be converted into energy and vice versa.
2. Energy is always conserved.
3. Mass is a form of energy that cannot be transformed.
4. Energy can only be created, not destroyed.

Correct Answer: Mass can be converted into energy and vice versa.

Solution:

Einstein\'s mass-energy equivalence, expressed as E=mc², states that mass can be converted into energy and vice versa, highlighting the interrelationship between mass and energy.