lf Einstein’s photoelectric equation is represented by hf - W = Φ where h is Planck’s constant, f the frequency of incident radiation and W the work function of the material, what does the symbol Φ up stand for?

A. Energy of the photons
B. Maximum Kinetic energy of the ejected electrons  
C. Threshold frequency of the photons
D. Stopping potential of the electrons
E. Velocity of the electrons

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Correct Answer: B