Discussion
Which detector suits a scanning ultraviolet-visible instrument?
Answer: C
A photomultiplier is fast, sensitive and covers the whole ultraviolet and visible range, which is what a scanning instrument needs. Thermocouples and pyroelectric detectors belong to the infrared, where photon detectors perform poorly, and lead sulphide serves the near infrared. Matching the detector to the photon energies available is what decides between them, and ultraviolet photons are energetic enough for a photoemissive device to work. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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