According to Bohr's model, an electron in a hydrogen atom radiates energy when it
- A. moves in a stable orbit
- B. jumps from a higher energy level to a lower one
- C. jumps from a lower energy level to a higher one
- D. is at rest in the nucleus
Explanation
Bohr postulated that an electron in an allowed orbit does not radiate at all, contradicting classical electromagnetism, and that a photon is emitted only when it drops to a lower level, carrying exactly the energy difference. Absorbing a photon does the reverse and lifts the electron to a higher level. This is why emission and absorption spectra of an element show lines at the same wavelengths.
Related questions
The energy of the electron in the ground state of a hydrogen atom is
The Balmer series of hydrogen lines lies in the visible region because all its transitions end at
The Lyman series of hydrogen appears in which region of the spectrum?
Bohr postulated that the angular momentum of an electron in an allowed orbit is
An absorption spectrum is produced when