Question

1. in addition to einsteins theory of relativity, describe two other important discoveries einstein made during his life.

Explanation:

1. Photoelectric effect: Einstein proposed that light consists of discrete packets of energy called photons. This explanation of the photoelectric effect, for which he won the Nobel - Prize in Physics in 1921, helped establish the dual - nature of light (particle - wave duality).
2. Brownian motion: Einstein provided a theoretical explanation for Brownian motion, which is the random movement of particles suspended in a fluid. His work confirmed the existence of atoms and molecules.

Answer:

1. Photoelectric effect: He proposed light is made of photons, explaining the photoelectric effect and contributing to the concept of light's dual - nature.
2. Brownian motion: His theoretical explanation confirmed the existence of atoms and molecules.