What does electrons not radiate while revolving in discrete orbits in Bohr's postulates model of an atom?

Electrons do not radiate while revolving in discrete orbits in Bohr's postulates model of an atom due to the following reasons:

1. According to Bohr's model, electrons can only occupy specific energy levels or orbits around the nucleus of an atom. These energy levels are quantized, meaning they have fixed values and do not change continuously.

2. Electrons in these discrete orbits have specific amounts of energy associated with them. When an electron is in one of these stable orbits, it is in a state of minimum energy and is said to be in a "stationary state."

3. According to classical electromagnetic theory, an accelerated charged particle, such as an electron moving in a circular orbit, should emit electromagnetic radiation. This radiation would cause the electron to lose energy and eventually spiral into the nucleus, leading to the collapse of the atom.

4. However, Bohr proposed that electrons in his model do not continuously emit radiation while in their stable orbits. He suggested that the electron's energy is quantized and can only change by discrete amounts when it jumps from one energy level to another.

5. The emission or absorption of radiation occurs only when an electron transitions between energy levels. When an electron absorbs energy, it moves to a higher energy level, and when it emits energy, it moves to a lower energy level.

6. These transitions between energy levels are accompanied by the emission or absorption of photons, which are packets of electromagnetic radiation. The energy of the emitted or absorbed photons corresponds to the energy difference between the initial and final energy levels of the electron.

7. Therefore, in Bohr's model, electrons do not continuously radiate energy while in their stable orbits. They only emit or absorb energy in discrete amounts when transitioning between energy levels.

In summary, electrons do not radiate while revolving in discrete orbits in Bohr's postulates model of an atom because their energy is quantized, and they only emit or absorb energy in discrete amounts during transitions between energy levels.