Scientists described light as a wave because the results of many experiments with light demonstrated that light behaves as a wave. Light is now described as having properties of both a wave and a particle. What is the most likely reason why this change was made?

Experiments such as the photoelectric effect revealed results that a wave-only model of light could not explain. Scientists therefore added the idea that light also behaves like particles, rather than changing the description simply because of a vote or one scientist’s paper. The best choice is “Data collected from many experiments could not be explained using waves.”

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