The Science of Light and Lasers | Szydlo's At Home Science
"Laser is a device for producing a special type of light and intensely concentrated beam of light which is coherent. Coherent means essentially two things. The light, all of the light that comes out has exactly the same wavelength. Furthermore, it is coherent which means that all the waves move up and down together in the same phase."
"Study of energy is particularly difficult because energy is intangible. We recognize energy by its capacity to do work which is the formal definition."
"Just to give you an idea of how very very difficult this topic is the great French chemist Antoine Lavoisier included in his table of elements such as carbon, hydrogen, sulfur, he included also light and caloric. Caloric is french for heat. Bu these are two forms of energy. Now that doesnt show you that he was stupid, it just show you how very very difficult these ideas were."
"Thomas Young was actually able to using his slits to measure the wavelength of light so that was quite extraordinary."
"He (Faraday) proved experimentally that light actually has a magnetic property, is magnetic."
"Bunsen and Kirchoff recognize the fact that a fundamental property of every element is its spectrum. And to that effect a new technique developed called spectral analysis people were able to analyze the spectrum and to show the presence of elements in various minerals etc."
"When they started investigating liquids a remarkable discovery is made and the discovery that was made was that certain liquids which we now call electrolytes were able to be changed by a passage of an electric current and a reaction which we call electrolysis and this started raising very serious questions about Dalton's atomic theory and the idea of atoms as being entities which cannot be changed anyway."
youtube.com/watch?v=mb61Coc...
Further investigation topics: Sun's corona,
Joseph von Fraunhofer, Paddle wheel experiment, Ladenburg, Theodore Maiman, George Porter
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