The photoelectric current is known to be directly proportional to the intensity of incident light with fixed frequency. Questions: 1) What are the experimental values of this proportionality constant for various fixed frequencies? 2) Is there a theoretical derivation that provides a formula for this proportionality constant? 3) What is the relationship of photoelectric current and frequency of incident light with fixed intensity? 4) What are the experimental and theoretical 'incongruencies' to the standard photoelectric effect explanation?