M. Suhail Zubairy
- Published in print:
- 2020
- Published Online:
- June 2020
- ISBN:
- 9780198854227
- eISBN:
- 9780191888649
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/oso/9780198854227.003.0006
- Subject:
- Physics, Particle Physics / Astrophysics / Cosmology, Theoretical, Computational, and Statistical Physics
In this chapter, three problems whose resolution laid the foundation of quantum mechanics are discussed. First the pioneering work of Max Planck is described who explained the spectrum of light ...
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In this chapter, three problems whose resolution laid the foundation of quantum mechanics are discussed. First the pioneering work of Max Planck is described who explained the spectrum of light emitted from a so-called blackbody by making a bold ansatz that the energy associated with the oscillations of electrons comes in packets or quanta of energy. Second it is shown how Einstein invoked Planck’s hypothesis to explain the photoelectric effect by arguing that light should come in packets or quanta of energy and this energy should be proportional to the frequency. Electrons are emitted if the energy of the quantum of light, which has come to be known as a photon, is higher than a critical value. The third problem relates to the atomic structure of hydrogen. A full description is given of how Bohr applied a quantization condition to explain the emission of light at certain specific frequencies.Less
In this chapter, three problems whose resolution laid the foundation of quantum mechanics are discussed. First the pioneering work of Max Planck is described who explained the spectrum of light emitted from a so-called blackbody by making a bold ansatz that the energy associated with the oscillations of electrons comes in packets or quanta of energy. Second it is shown how Einstein invoked Planck’s hypothesis to explain the photoelectric effect by arguing that light should come in packets or quanta of energy and this energy should be proportional to the frequency. Electrons are emitted if the energy of the quantum of light, which has come to be known as a photon, is higher than a critical value. The third problem relates to the atomic structure of hydrogen. A full description is given of how Bohr applied a quantization condition to explain the emission of light at certain specific frequencies.
Jeremy Zallen
- Published in print:
- 2019
- Published Online:
- September 2020
- ISBN:
- 9781469653327
- eISBN:
- 9781469653341
- Item type:
- book
- Publisher:
- University of North Carolina Press
- DOI:
- 10.5149/northcarolina/9781469653327.001.0001
- Subject:
- History, History of Science, Technology, and Medicine
The myth of light and progress has blinded us. In our electric world, we are everywhere surrounded by effortlessly glowing lights that simply exist, as they should, seemingly clear and comforting ...
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The myth of light and progress has blinded us. In our electric world, we are everywhere surrounded by effortlessly glowing lights that simply exist, as they should, seemingly clear and comforting proof that human genius means the present will always be better than the past, and the future better still. At best, this is half the story. At worst, it is a lie.
From whale oil to kerosene, from the colonial period to the end of the U.S. Civil War, modern, industrial lights brought wonderful improvements and incredible wealth to some. But for most workers, free and unfree, human and nonhuman, these lights were catastrophes. This book tells their stories. The surprisingly violent struggle to produce, control, and consume the changing means of illumination over the eighteenth and nineteenth centuries transformed slavery, industrial capitalism, and urban families in profound, often hidden ways. Only by taking the lives of whalers and enslaved turpentine makers, match-manufacturing children and coal miners, night-working seamstresses and the streetlamp-lit poor--those American lucifers--as seriously as those of inventors and businessmen can the full significance of the revolution of artificial light be understood.Less
The myth of light and progress has blinded us. In our electric world, we are everywhere surrounded by effortlessly glowing lights that simply exist, as they should, seemingly clear and comforting proof that human genius means the present will always be better than the past, and the future better still. At best, this is half the story. At worst, it is a lie.
From whale oil to kerosene, from the colonial period to the end of the U.S. Civil War, modern, industrial lights brought wonderful improvements and incredible wealth to some. But for most workers, free and unfree, human and nonhuman, these lights were catastrophes. This book tells their stories. The surprisingly violent struggle to produce, control, and consume the changing means of illumination over the eighteenth and nineteenth centuries transformed slavery, industrial capitalism, and urban families in profound, often hidden ways. Only by taking the lives of whalers and enslaved turpentine makers, match-manufacturing children and coal miners, night-working seamstresses and the streetlamp-lit poor--those American lucifers--as seriously as those of inventors and businessmen can the full significance of the revolution of artificial light be understood.
