The Pressure of Light Being An Abstract of the Thirteenth Robert Boyle Lecture
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The whole earth experiences from sunlight only a pressure of about 75, 000 tons. Even against the surface of the sun, the back pressure is only about ii mgm. Per sq. Cm. The first experiments to show this pressure of light were published by Lebedew six years ago. He sus- pended a small disc in a very high vacuum, and allowed a beam of light to fall on the disc. He found that the disc was repelled. Simultaneously Nichols and Hull were working in a similar manner, and they showed that the pressur...e observed was, as nearly as could be 6 THE PRESSURE OF LIGHT measured, equal to the energy in i c. C. Of the beam. They succeeded in showing the equality within i / .
Thus a beam of light receives momentum from its source, carries the momentum through space, and delivers it up as pressure to any surface on which it falls. Some experiments made by Dr. Barlow and the lecturer 1 bring out this idea that light is to be regarded as a stream of momentum. If a beam falls obliquely on an absorbing surface, it should exert both a normal pressure and a tangential stress on the absorbing surface.
What to read after The Pressure of Light Being An Abstract of the Thirteenth Robert Boyle Lecture?
You can find similar books in the "Read Also" column, or choose other free books by J H John Henry Poynting to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The whole earth experiences from sunlight only a pressure of about 75, 000 tons. Even against the surface of the sun, the back pressure is only about ii mgm. Per sq. Cm. The first experiments to show this pressure of light were published by Lebedew six years ago. He sus- pended a small disc in a very high vacuum, and allowed a beam of light to fall on the disc. He found that the disc was repelled. Simultaneously Nichols and Hull were working in a similar manner, and they showed that the pressur...e observed was, as nearly as could be 6 THE PRESSURE OF LIGHT measured, equal to the energy in i c. C. Of the beam. They succeeded in showing the equality within i / .
Thus a beam of light receives momentum from its source, carries the momentum through space, and delivers it up as pressure to any surface on which it falls. Some experiments made by Dr. Barlow and the lecturer 1 bring out this idea that light is to be regarded as a stream of momentum. If a beam falls obliquely on an absorbing surface, it should exert both a normal pressure and a tangential stress on the absorbing surface.
What to read after The Pressure of Light Being An Abstract of the Thirteenth Robert Boyle Lecture?
You can find similar books in the "Read Also" column, or choose other free books by J H John Henry Poynting to read onlineMoreLess
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