Question

Concept of stationary orbit was introduced by:
A. Bohr
B. Rutherford
C. Sommerfeld
D. Thomson

Answer 1

Hint: According to the scientist it was proposed that the electrons tends to revolve around the nucleus because electron is a negatively charged species and therefore experience the attractive force from the positively charged nucleus and thus revolves around the nucleus in the stationary orbits and hence maintain the stability.

Complete Solution :
- As we know that the concept of stationary orbit was introduced by Bohr's atomic model. According to this model it was proposed that the electrons tend to revolve around the nucleus in the fixed orbit which is also called as the stationary orbit, where the negatively charged electrons experience the attractive force by the positively charged nucleus.
- Now, as the nucleus is present in its ground state therefore the electrons with the fixed energy revolve in the particular orbital with quantized energy and size. Hence, have the most stable arrangement.
- So, here we can say that is it only possible for the electrons to lose or gain its energy to get back to their original stable arrangement and this can be possible by jumping of the electrons from the higher energy level to the lower energy level through the loss of the energy in the form of photons or its can also jump from lower energy level to higher energy level through the absorption of photon. Therefore the energy present in the atom will remain conserved.
Hence, we can say that the concept of stationary orbit is introduced by Bohr's.
So, the correct answer is “Option A”.

Note: You should know that as long as an electron is present in the particular orbit, the electron can never lose its energy through its own. When electrons revolve in stable orbits, the centripetally accelerated electrons do not radiate any form of energy and therefore the atom remains stable.