Remains unaltered
Increases
Reaches maximum
Decreases
Answer is Right!
Answer is Wrong!
The correct answer is D. Decreases.
A light-dependent resistor (LDR) is a resistor whose resistance decreases with increasing incident light. This is because the photons of light excite electrons in the semiconductor material of the LDR, causing them to move to a higher energy state. This movement of electrons creates a current that flows through the LDR, which decreases its resistance.
Option A is incorrect because the resistance of an LDR does not remain unaltered when exposed to radiant energy. Option B is incorrect because the resistance of an LDR does not increase when exposed to radiant energy. Option C is incorrect because the resistance of an LDR does not reach a maximum when exposed to radiant energy.