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a) What is the physical significance of the intercept of the graph with the frequency axis (x-axis)?

b) What is the physical significance of the intercept of the graph with the kinetic energy axis (y-axis)?

c) Use the graph to determine the value of Planck’s constant

d) In a similar experiment, the cathode of the photocell is replaced with a cathode that has a stronger force of attraction for its electrons. Describe how a graph of kinetic energy against frequency would be

i. Similar to the given graph

ii. Different from the given graph

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# Physical significance

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