Question

In which transition one quantum of energy is emitted?
A. $n=4\to n=2$
B. $n=3\to n=1$
C. $n=4\to n=1$
D. All of them

Answer 1

If an electron jumps from higher orbital to lower orbital then the electron releases or emits some amount of energy. The amount of energy absorbed or emitted by an electron when jumping from one orbit to the other orbital is equal to one quantum.

Complete step by step answer:
- In the question it is given that one quantum of energy released means the electron should jump from higher orbit to lower orbit.
-We have to check with the given options.
-In option A, $n=4\to n=2$. Here the electron is jumping from fourth orbit to second orbit means moving from higher orbit to lower orbit then the electron releases energy.
-In option B, $n=3\to n=1$. Here the electron is jumping from third orbit to first orbit means moving from higher orbit to lower orbit then the electron releases energy.
-In option C, $n=4\to n=1$. Here the electron is jumping from fourth orbit to first orbit means moving from higher orbit to lower orbit then the electron releases energy.
-Whenever an electron jumps from higher orbit to lower orbit or lower orbit to higher orbit, the energy released or absorbed is equal to one quantum.
-Therefore, in all the options energy is released is equal to one quantum.

-So, the correct option is D, all of them.

Note: The energy related concept came from Bhor’s atomic model. According to Bohr’s atomic model or atomic theory, electrons will move in fixed orbits around the nucleus called stationary orbits. If the electron stays in the same orbit then the energy of the electrons remains the same. If the electron absorbs energy then it will jump from lower orbits to higher orbits. If the electron is releasing energy, the electron jumps from higher orbit to lower orbit.