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Quantum mechanics describes the microscopic properties of nature in a regime where classical mechanics no longer applies. It explains phenomena such as the wave-particle duality, quantization of energy, and the uncertainty principle and is generally used in single-body systems. Use the quantum-field-theory tag for the theory of many-body quantum-mechanical systems.

16 votes
7 answers
11k views

How can photons have an electric field without having a charge?

I've been reading up on photons, and find myself puzzled by an element of them... How can photons have an electric field without having a charge? Correct me if I am wrong but I believe electric fields …
0 votes
2 answers
258 views

If an atom has 'infinite energy levels', how does the photoelectric effect exist?

I don't quite get claims that an atom has 'infinite energy levels'. The photo-electric effect tells us that if photons of a certain threshold of energy are absorbed, the electrons will be freed from t …