Distinguish between intrinsic and extrinsic conduction in a semiconductor - Leaving Cert Physics - Question h(i) - 2020
Question h(i)
Distinguish between intrinsic and extrinsic conduction in a semiconductor.
the diagram shows a sketch of a photocell:
a. What particles move between the electrodes... show full transcript
Worked Solution & Example Answer:Distinguish between intrinsic and extrinsic conduction in a semiconductor - Leaving Cert Physics - Question h(i) - 2020
Step 1
What particles move between the electrodes of the photocell?
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Answer
The particles that move between the electrodes of the photocell are electrons. In a photocell, when light strikes the semiconductor material, it excites electrons, allowing them to flow from the cathode to the anode.
Step 2
In what direction do the particles move?
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Answer
The electrons move from the cathode to the anode. This movement occurs due to the electric field established in the photocell, guiding the flow of the negatively charged electrons toward the positively charged anode.
Step 3
Write a nuclear equation to show the pair annihilation of a positron and an electron.
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Answer
The nuclear equation for the pair annihilation of a positron and an electron can be represented as:
e−+e+→2γ
This equation shows that when an electron (e^-) and a positron (e^+) collide, they annihilate each other, producing two gamma photons (( \gamma )).
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