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Posts Tagged ‘Light Wave’

Is Light A Particle Or Wave? ‘Quantum Nonlocality’ Experiment Spotlights Dual Nature Of Light

Posted by Ram Kumar Shrestha on November 6, 2012

By: Clara Moskowitz, LiveScience Senior Writer

Is light made of waves, or particles?

This fundamental question has dogged scientists for decades, because light seems to be both. However, until now, experiments have revealed light to act either like a particle, or a wave, but never the two at once.

Now, for the first time, a new type of experiment has shown light behaving like both a particle and a wave simultaneously, providing a new dimension to the quandary that could help reveal the true nature of light, and of the whole quantum world.

The debate goes back at least as far as Isaac Newton, who advocated that light was made of particles, and James Clerk Maxwell, whose successful theory of electromagnetism, unifying the forces of electricity and magnetism into one, relied on a model of light as a wave. Then in 1905, Albert Einstein explained a phenomenon called the photoelectric effect using the idea that light was made of particles called photons (this discovery won him the Nobel Prize in physics). [What’s That? Your Physics Questions Answered]

Ultimately, there’s good reason to think that light is both a particle and a wave. In fact, the same seems to be true of all subatomic particles, including electrons and quarks and even the recently discovered Higgs boson-like particle. The idea is calledwave-particle duality, and is a fundamental tenet of the theory of quantum mechanics.

Depending on which type of experiment is used, light, or any other type of particle, will behave like a particle or like a wave. So far, both aspects of light’s nature haven’t been observed at the same time. Read the rest of this entry »

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