Atoms And Nuclei Question 141
Question: If the energy of a hydrogen atom in nth orbit is $ E_{n} $ , then energy in the nth orbit of a singley ionized helium atom will be [BHU 2004]
Options:
A) $ 4E_{n} $
B) $ E_{n}/4 $
C) $ 2E_{n} $
D) $ E_{n}/2 $
Show Answer
Answer:
Correct Answer: A
Solution:
$ E_{n}\propto Z^{2} $
Þ $ \frac{{(E_n)}_He}{{(E_n)}_H}=\frac{Z_He^{2}}{Z_H^{2}}=4 $
Þ $ {{(E_n)}_He}=4\times {{(E_n)}_H} $
