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Which one of the following materials would be used for making an LDR?

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Which one of the following materials would be used for making an LDR?

(a) Lead Sulfide

(b) Pure Aluminum

(c) Iron Ore

(d) Aluminum Oxide

The question was posed to me in exam.

Question is from LDR Sensor topic in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino

1 Answer

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Correct choice is (a) Lead Sulfide

Easy explanation: What the LDR needs is a semiconductor. So that when some light having enough energy strikes on it, more electrons are excited to the conduction band which results in large number of charge carriers which in turn results in current flowing through it when the circuit is closed.

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