K.C.S.E Physics Q & A - MODEL 2010PP2QN19
​(a) State the property of radiation that determines the number of electrons emitted when a radiation falls on a metal surface.
(b) Figure 15 is a graph of the stopping potential Vs against frequency in an experiment on photoelectric effect.
​(i) What is meant by stopping potential?
(ii) Given that the stopping potential Vs is related to the frequency by the equation
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