Question
Question: An electron with kinetic energy E eV collides with a hydrogen atom in the ground state. The collisio...
An electron with kinetic energy E eV collides with a hydrogen atom in the ground state. The collision is observed to be elastic for
A
0 < E <¥
B
0 < E < 10.2 eV
C
0 < E < 13.6 eV
D
None
Answer
0 < E < 10.2 eV
Explanation
Solution
electron in 1st orbit of H-atom need 10.2 eV energy to exicited in to 2nd orbit
DE = E2 – E1 = –3.4 –(13.6) = 10.2 eV