What phenomena require a wave description of light?
What phenomena require a particle picture of light?
How are the two aspects related quantitatively?
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Question

anonymous · Answer

Interference and diffraction show the wave nature of light and the phenomena such as photoelectric effect show the particle nature of light..

anonymous · Answer

As we all know, Light is Dual in nature i.e particle and wave.Well Interference and diffraction show wave nature of light as they satisfy the  sinusoidal wave equation.Photoelectric effect shows particle nature of light..We consider electrons and photons for this effect which is comparatively tiny.Well Wave is not a quatity!

chmvijay · Answer

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they both can be related 
diffraction shows wave nautre of light 
and photoelectric effect shows the particle nature of light
u can convert or imagine the particle to wave by the following de broglies relation