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Commonly used photoemissive material is _______

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Commonly used photoemissive material is _______

(a) gold

(b) opium

(c) tellurium

(d) cesium-antimony

This question was posed to me in a job interview.

I'm obligated to ask this question of Photoelectric Transducers topic in chapter Transducers of Electrical Measurements

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The correct choice is (d) cesium-antimony

To elaborate: Cesium-antimony is the most commonly used photoemissive material. The photoemissive material is housed in a glass tube. Photoemissive devices are also called as phototubes.

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