Bohr Model of Hydrogen Atom

The Bohr model of the hydrogen atom, proposed by Niels Bohr in 1913, is a simplified model that describes the behavior of electrons in the hydrogen atom. It is a significant contribution to the understanding of atomic structure and the emission of radiation.

Electron Orbits in the Bohr Model

According to the Bohr model, electrons in a hydrogen atom revolve around the nucleus in specific circular orbits or energy levels. Each energy level is associated with a specific amount of energy, and the electron can only occupy these discrete energy levels.

The energy levels are labeled with quantum numbers, where the lowest energy level is labeled as n=1, followed by n=2, n=3, and so on. The energy of each level increases as the value of n increases. The electron is more stable when it is in the lower energy levels closer to the nucleus.

Emission of Radiation

One of the key features of the Bohr model is that it explains the emission of radiation by the hydrogen atom. According to the model, radiation is emitted when the electron jumps from a higher energy level to a lower energy level. This process is known as an electronic transition.

When an electron absorbs energy, it can move to a higher energy level. This can happen, for example, when the atom absorbs light or heat. However, the electron is not stable in the higher energy level and tends to return to its original lower energy level.

Energy Levels and Transitions

When an electron transitions from a higher energy level to a lower energy level, it releases energy in the form of electromagnetic radiation. The energy of the emitted radiation corresponds to the energy difference between the initial and final energy levels.

The energy of the emitted radiation can be calculated using the equation ΔE = E_final - E_initial, where ΔE is the energy of the emitted radiation, E_final is the energy of the final energy level, and E_initial is the energy of the initial energy level.

Explanation of the Correct Answer

In the given question, the correct answer is option 'A' - when the electron jumps from a higher orbit into a lower orbit. This is because the Bohr model states that radiation is emitted when an electron transitions from a higher energy level to a lower energy level.

When the electron jumps to a lower energy level, it releases energy in the form of radiation. This radiation can be observed as light or other electromagnetic waves. The emitted radiation carries away the excess energy that the electron had gained when it was in the higher energy level.

Therefore, option 'A' is the correct answer as per the Bohr model of the hydrogen atom.