Photoelectric detectors are more sensitive to slow, smoldering fires
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Photoelectric detectors are best used for detecting smoke and fire in various settings such as homes, offices, and public buildings. These detectors work by detecting the presence of smoke particles in the air, triggering an alarm and allowing prompt action to be taken. They are particularly effective in detecting smoldering fires, which may produce more smoke before flames are visible.
americinium is used in smoke detectors to check for smoke
Created the theory of relativity and explained the photoelectric effect
The photoelectric effect, for which he won his Nobel Prize, and the Theory of General Relativity.
He failed math in high school but later went on to postulate the theory of relativity, and he got the Nobel prize for his work on the photoelectric effect.
Just one - 1921 Nobel prize (physics). Curiously, rather than receiving an award for his more famous work on relativity, he won it for his work on the photoelectric effect, which was responsible, in part at least, for the development of quantum theory. It is arguable that, given the work that had been done previously by the likes of, for example, Lorentz, relativity was a theory waiting to happen, whereas the photoelectric effect was much more novel and far-reaching in its effects.