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Alexander Stoletov, Russian physicist, founder of electrical engineering, and professor in Moscow University, was born on10 August 1839.
Contribution to science:
Stoletov was the first to show that with the increase of the magnetic field the magnetic susceptibility of iron grows, but then begins to decrease.
Built the curve of the magnetic permeability of ferromagnetics, known as the Stoletov curve.
Developed two new methods for measuring magnetic properties of various materials.
Photoelectric effect (1888–1891)
Studied the outer photoelectric effect, discovered by Hertz
in 1887. Published the results in six works.
Developed quantitative methods for the study of the photoelectric effect.
Discovered the direct proportionality between the intensity of light and the corresponding photo induced current (Stoletov's law)
Discovered the Stoletov constant which defines the ratio between the intensity of the electric current and the gas pressure under the maximum current.
Built the first solar cell based on the outer photoelectric effect and estimated the response time of the photoelectric current.
Discovered the decrease of the solar cell's sensitivity with time (fatigue of solar cells).
Calculated the proportion between electrodynamic and electrostatic units, producing a value very close to the speed of light.