Question

In Bohr’s atomic model of hydrogen, let K, P and E are the kinetic energy, potential energy and total energy of the electron respectively. Choose the correct option when the electron undergoes transitions to a higher level:

• A. All K, P and E increase
• B. K decreases, P and E increase
• C. P decreases, K and E increase
• D. K increases, P and E decrease

Answer 1

Answer: (B)

K decreases, P and E increase

Answer 2

$TE = \frac{-Z^2me^4}{8(nh∈_0)^2}$

$PE = \frac{-Z^2me^4}{4(nh∈_0)^2}$

$KE = \frac{Z^2me^4}{8(nh∈_0)^2}$

As electron makes transition to higher level, total energy and potential energy increases (due to negative sign) while the kinetic energy reduces.