Which of the following detectors is used to detect light intensities which are very weak?(a) Photomultiplier tube(b) Photovoltaic cell(c) Photoemissive tubes(d) Photo reflectorI had been asked this question in an interview for internship.Origin of the question is Absorption Instrumentation and Block Diagram Representation topic in division Colorimetry and Spectrometry of Analytical Instrumentation

Which of the following detectors is used to detect light intensities w

1.	Which of the following detectors is used to detect light intensities which are very weak?(a) Photomultiplier tube(b) Photovoltaic cell(c) Photoemissive tubes(d) Photo reflectorI had been asked this question in an interview for internship.Origin of the question is Absorption Instrumentation and Block Diagram Representation topic in division Colorimetry and Spectrometry of Analytical Instrumentation
Answer» The correct answer is (a) Photomultiplier tube The best I can explain: PMT is used for DETECTION of light intensities which are WEAK. As the NAME suggests, Photomultiplier tube multiplies the incident electrons using DYNODES causing an AVALANCHE of electrons.

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