MHT CET2009PhysicsAtomic Physics
The radius of hydrogen a tomin its ground state is 5.3 10⁻¹¹ ~m . After collision with an electron it is found to have a radius of 21.2 10⁻¹¹ ~m . What is the prindpal quantum number n of the final state of atom?
Options
- An=4
- Bn=2
- Cn=16
- Dn=3
Correct answer
B. n=2
Step-by-step solution
r n² ie, r_ f r_ i = ( n_ f n_ i )² array l 21.2 10⁻¹¹ 5.3 10⁻¹¹ = [ n 1 ]² n²=4 n=2 array