According to Neils Bohr, an Electron in an Excited State

question 16

Multiple Choice

According to Neils Bohr, an electron in an excited state could give off

• A) several photons in a series of transitions to the ground state.
• B) at most a single photon until the atom was excited again.
• C) a continuous cascade of photons for a high-level transition.
• D) none of these

---

Definitions:

Immune System

The body's defense mechanism against infections, diseases, and other potentially damaging foreign bodies.

Foreign Invaders

External pathogens such as viruses, bacteria, and other microbes that can cause disease in a host organism.

White Blood Cells

Cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders.

Leukocytes

White blood cells that are part of the immune system, helping the body to fight infections and other diseases.