Electronic Devices Question 242

Question: The Bohr radius of the fifth electron of phosphorus (atomic number = 15) acting as dopant in silicon (relative dielectric constant = 12) is

Options:

A) 10.6 Å

B) 0.53 Å

C) 21.2 Å

D) None of these

Show Answer

Answer:

Correct Answer: A

Solution:

$ r _{n}={\varepsilon _{r}}( \frac{n^{2}}{Z} )a _{o}=12\times \frac{(5^{2})}{15}\times 0.53 $ = 10.6 Å.



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