Discuss the relevant features of a photomultiplier including the following: construction - principle of operation - explain what is meant by responsivity. plot an example responsivity of a photomultiplier as a function of wavelength - applications of photomultipliers b) (10 marks) discuss the relevant features of a photodiode including the following: construction principle of operation. include a suitable circuit diagram these photodiodes require to operate. schematic responsivity as a function of wavelength - applications

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Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current