The following text discusses physics.
Quantum entanglement describes a phenomenon in which particles become correlated so that measuring one instantly affects the other, regardless of distance. Einstein famously called this "spooky action at a distance," doubting it could be real. Experiments have since confirmed entanglement occurs as quantum mechanics predicts. However, this does not allow faster-than-light communication, as the results of measurements appear random until compared. Entanglement may eventually enable ultra-secure communications and powerful quantum computers.
What does the text clarify about quantum entanglement?
It allows instant communication across any distance
Einstein proved it did not exist
It is confirmed real but cannot be used for faster-than-light communication
It has no potential practical applications
Correct Answer: C
Choice C is the correct answer. The text states experiments "confirmed entanglement occurs" and "this does not allow faster-than-light communication."
- Evidence: Confirmed real; no faster-than-light communication possible.
- Reasoning: The text clarifies both existence and limitations.
- Conclusion: Real but with communication limitations.
Choice A is incorrect because faster-than-light communication is explicitly ruled out. Choice B is incorrect because experiments confirmed what Einstein doubted. Choice D is incorrect because secure communications and quantum computers are mentioned.