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Physics 6 Online
OpenStudy (anonymous):

How does photoelectric effect justify the particle nature of light?

OpenStudy (astrophysics):

Read this, it's awesome. http://physics.info/photoelectric/

OpenStudy (irishboy123):

awesome question!! it suggests, in the most primitive sense, that a torch's colour is more important than the torch's battery input. so the colour matters more than the brightness. so, why is that?

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