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Which of the following detectors is used to detect light intensities which are very weak?

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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 reflector

I 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

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Best 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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