Discussion
Which detector is used in a simple visible spectrophotometer?
Answer: B
A silicon photodiode is cheap, rugged, linear and sensitive enough across the visible, which is why it dominates routine instruments. A photomultiplier is used where the highest sensitivity is needed, thermocouples belong to the infrared where photon detectors are poor, and a hollow cathode lamp is a source rather than a detector. Matching the detector to the wavelength range and the sensitivity required is what decides between them. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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