What happens to the conductivity of a...

Question 1 / 27070e3UGDUomc3K0ITptjg7O

Question 1 of 27070e3UGDUomc3K0ITptjg7O

What happens to the conductivity of a photosensitive semiconductor junction when it is illuminated?

Question 1 of 27070

What happens to the conductivity of a photosensitive semiconductor junction when it is illuminated?

🔍 Key Concepts

• Photosensitive (photoelectric) effect in semiconductors – what light does to charge carriers • Relationship between resistance, conductivity, and number of charge carriers • How illumination changes current flow through a junction compared to darkness

💭 Think About

• Think about what extra light energy does inside a semiconductor: does it create more or fewer free charge carriers? • If more charge carriers are available, how does that affect the material’s ability to conduct current and thus its resistance? • Compare the behavior of a light-dependent resistor or photodiode in the dark versus under bright light: does current flow more easily or less easily?

✅ Before You Answer

• Remember that conductivity and resistance are inversely related: if one goes up, the other goes down. • Focus on the direct effect of light, not secondary effects like temperature, unless the question explicitly mentions them. • Ask: under illumination, does the junction act more like an open circuit or more like a closed/low-resistance path for current?

Question 1 of 27070

What happens to the conductivity of a photosensitive semiconductor junction when it is illuminated?

The junction resistance is unchanged.

The junction resistance decreases .

The junction resistance becomes temperature dependent.

The junction resistance increases

Question 1 / 27070e3UGDUomc3K0ITptjg7O

Question 1 of 27070e3UGDUomc3K0ITptjg7O

What happens to the conductivity of a photosensitive semiconductor junction when it is illuminated?

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Question 1 of 27070

What happens to the conductivity of a photosensitive semiconductor junction when it is illuminated?