The Photoelectric Effect

The photoelectric effect:

A) was discovered by Max Planck
B) describes the phenomenon of producing light by shining a beam of electrons by on any metal surface
C) contradicted the view that light energy was dependent upon intensity only
D) is not the same principle used in modern electric eyes and solar calculators
E) results in a beam of electrons which increases in number,but not velocity,as the wavelength of incident light decreases

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