Atoms And Nuclei Question 106
Question: Radius of the first orbit of the electron in a hydrogen atom is 0.53 Å. So, the radius of the third orbit will be [Kerala (Engg.) 2001]
Options:
A) 2.12 Å
B) 4.77 Å
C) 1.06 Å
D) 1.59 Å
Show Answer
Answer:
Correct Answer: B
Solution:
$ r_{n}\propto n^{2}\Rightarrow \frac{r_{3}}{r_{1}}=\frac{3^{2}}{1}\Rightarrow r_{3}=9r_{1}=9\times 0.53=4.77{\AA} $
