Albert Einstein was a German-born theoretical physicist ,developed the theory of relativity, one of the two pillars of modern physicsEinstein was born at Ulm, in Württemberg, Germany, on March 14, 1879.His equation explain special relativity – E = mc2 – is famous understand the underlying physics and photoelectric effect.
Theory of special relativity: Einstein showed that physical laws that speed of light in a vacuum is always the same, no matter at what speed the observer is travelling ,realization that space and time are linked into what we now call space-time.
Photoelectric effect: Einstein's work that light should as a stream of particles (photons) single wave, as was commonly thought by the time. The photoelectric effect that electrons are ejected from the surface of a metal due to incident light. The "wave" theory of light electrons should be ejected with more energy when the incident light is increased.
Special Relativity - it's impossible to determine if moving unless you can look at another object. It that measurements of distance and time depend on how fast you are travelling.
His contributions includes in the fields of relativistic cosmology, capillary action, critical opalescence, classical problems of statistical mechanics and application to quantum theory, Brownian movement of molecules, atomic transition probabilities, the quantum theory of a monatomic gas, thermal properties of light with low radiation density .