Final answer:
The statement is false; electrons in Bohr's model do move in fixed orbits but their speeds are not constant as they can jump between different energy levels, absorbing or emitting energy in the process.
Step-by-step explanation:
The statement is false. In Bohr's model of the atom, electrons are indeed thought to move in fixed orbits around the nucleus, known as energy levels. However, these electrons do not have a constant speed; they can jump from one energy level to another, which involves either absorbing or emitting energy. When electrons move to a higher energy level, they absorb energy, and when they return to a lower energy level, they emit energy in the form of light. Niels Bohr's model was based on the idea that the electron could occupy only certain regions of space, and while the model was successful in explaining atomic emission spectra, it did not account for the variation in speed when moving between these levels.
Bohr's model suggests that each atom has a set of unchangeable energy levels and electrons in the electron cloud must be in one of these energy levels. The Bohr model was vital for understanding how electrons absorb and release energy but later developments in quantum theory revealed that the electron’s behavior and movement are more complex than Bohr's fixed circular orbits.