Atomic Structure Question 120
Question: In a Bohr’s model of atom when an electron jumps from $ n=1 $ to $ n=3 $ , how much energy will be emitted or absorbed [CBSE PMT 1996]
Options:
A) $ 2.15\times {10^{-11}}erg $
B) $ 0.1911\times {10^{-10}}erg $
C) $ 2.389\times {10^{-12}}erg $
D) $ 0.239\times {10^{-10}}erg $
Show Answer
Answer:
Correct Answer: B
Solution:
According to Bohr-s model $ \Delta E=E_1-E_3 $
$ =2.179\times {10^{-11}}-\frac{2.179\times 10^{11}}{9} $
$ =\frac{8}{9}\times 2.179\times {10^{-11}} $
$ =1.91\times {10^{-11}} $
$ =0.191\times {10^{-10}}erg $ Since electron is going from $ n=1 $ to $ n=3 $ hence energy is absorbed.
