A Level Physics Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

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What occurs to the resistance of an LDR as light intensity increases?

Resistance increases

Resistance decreases

As light intensity increases, the resistance of a Light Dependent Resistor (LDR) decreases. LDRs are made from semiconductor materials that are sensitive to light. When light photons strike the material, they excite the electrons, allowing them to flow more freely and increasing the material's conductivity. This results in a lower resistance.

In practical applications, this property allows LDRs to be used in various light-sensing circuits, such as automatic lighting systems. The decrease in resistance as light intensity rises is fundamental to how LDRs function, making them effective for detecting changes in light levels.

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Resistance remains constant

Resistance fluctuates rapidly

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