Question

Kinetic energy of an electron in hydrogen atom increases
after transition from an orbit n₁ to another orbit n₂. Then
(a) n₁ < n₂
(b) n₁ > n₂
(c) it is not possible to predict
(d) none of these

Answer 1

Answer:

(c)it isn't possible to predict

Answer 2

Since kinetic energy of an electron in hydrogen atom increases on transition from an orbit n1 to an orbit n2, then n1>n2.

• Energy of an electron in the nth orbital of an hydrogen atom can be given by -13.6/n².
• Kinetic energy is equal to the negative of the total energy , i.e 13.6/n²
• Since KE(n1)<KE(n2) ⇒ 13.6/n1²<13.6/n2² ⇒n1²>n2² .
• Since n1 and n2 are positive integers, n1²>n2² ⇒ n1>n2.