Atoms And Nuclei Question 287
Question: The energy difference between the first two levels of hydrogen atom is 10.2 eV for another element of atomic number 10 and mass number 20, this will be
Options:
A) 2040 eV
B) 0.201 eV
C) 510 eV
D) 1020 eV
Show Answer
Answer:
Correct Answer: D
Solution:
-
For H atom $ E_{2}-E_{1}=10.2eV $
$ \text{For }Z=10, $
$ E_{1}=\frac{-13.6\times 10^{2}}{1^{2}}=-1360eV $
$ E_{2}=\frac{-13.6\times 10^{2}}{2^{2}}=-3.4\times 100=-340eV $
$ \therefore E_{2}-E_{1}=-340-( -1360 )=1020eV $
