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Q.

The potential barrier of a P-N junction diode is 50 meV, When an electron having energy 400 meV travels from P to N, after crossing the junction the energy of the electron is

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a

300 meV

b

350 meV

c

400 meV

d

450 meV

answer is A.

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Detailed Solution

detailed_solution_thumbnail

Potential barrier ‘d’ = 50 meV

Initial KE of electron = 400 meV

We know:

 KE of the electron increases when it moves from p to n side.

Final KE = (50 + 400) meV = 450 meV

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The potential barrier of a P-N junction diode is 50 meV, When an electron having energy 400 meV travels from P to N, after crossing the junction the energy of the electron is