Module: Photoelectric Effect #25

[Mariam Baghdasaryan 4F]

25. Photoelectric experiments gave rise to a new equation relating the energy of light to its frequency. Select the right equation.
A. λv = c
B. Ek = mv2/2
C. mv2/2 = hv - φ
D. E = hv
E. None of the above

Is E=hv the correct answer since it is the one that clearly relates energy to the frequency? I am confused because I thought this equation was known before the photoelectric experiments.

[Xiangkun Shi 3E]

The answer is E=hv. This equation is actually one main experiment result of the photoelectric experiment.