Question
Physics Question on Atoms
The radius of innermost orbit of a hydrogen atom is 5.3x10-11 m. What is the radius of the third allowed orbit of the hydrogen atom?
A
1.06Å
B
1.59Å
C
4.77Å
D
0.53Å
Answer
4.77Å
Explanation
Solution
The correct option is (C): 4.77Å
For n=3, we can write the corresponding electron radius as,
r_3=n^2r_1$$=9\times 5.3\times 10^{-11}= 4.77\times10^{-10}=4.77Å