Question

Which phenomenon explain particle nature of light waves?

Answer 1

Photoelectric effect, most commonly observed phenomenon with light can be explained by waves

Answer 2

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Einstein asserted that light is a particle containing energy corresponding to their wavelength. The photoelectric effect is a phenomenon where irradiating a blue light on metal emits electrons from it. However, red light does not cause electron emission from metal no matter how long or how intense the light is applied.