The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 11
John Henry Poynting. undergoing bombardment by the corpuscles , and it was quite natural to suppose that the surface was pressed back . We may illustrate the supposed mode of action by fixing a vertical tin disc at the end of an arm and ...
John Henry Poynting. undergoing bombardment by the corpuscles , and it was quite natural to suppose that the surface was pressed back . We may illustrate the supposed mode of action by fixing a vertical tin disc at the end of an arm and ...
Страница 45
... nature of the action to be looked for may be explained by considering ideal cases . Let us suppose in the first case that a beam with energy per cubic centimetre is allowed to fall normally on a very thin disc , perfectly black or fully ...
... nature of the action to be looked for may be explained by considering ideal cases . Let us suppose in the first case that a beam with energy per cubic centimetre is allowed to fall normally on a very thin disc , perfectly black or fully ...
Страница 51
... nature of the disc , and the second line gives the ratios of the deflections calculated on the supposition that the black reflects 5 per cent . and that the silver reflects 95 per cent . The third line gives the deflections which might ...
... nature of the disc , and the second line gives the ratios of the deflections calculated on the supposition that the black reflects 5 per cent . and that the silver reflects 95 per cent . The third line gives the deflections which might ...
Страница 52
... Nature , vol . 75 , Nov. 22 , 1906 , p . 90 . 2 Ann . der Physik , Bd . 32 , 1910 , p . 411 . absorbing surface it exerts a force which has a component 52 EXPERIMENTS ILLUSTRATING THE CARRIAGE OF MOMENTUM BY A BEAM OF LIGHT.
... Nature , vol . 75 , Nov. 22 , 1906 , p . 90 . 2 Ann . der Physik , Bd . 32 , 1910 , p . 411 . absorbing surface it exerts a force which has a component 52 EXPERIMENTS ILLUSTRATING THE CARRIAGE OF MOMENTUM BY A BEAM OF LIGHT.
Страница 75
John Henry Poynting. luminosity in the tail is due to electric action , the nature of the action is only as yet a matter of speculation . Perhaps we shall find some time that both light - pressure and electric action come into play ...
John Henry Poynting. luminosity in the tail is due to electric action , the nature of the action is only as yet a matter of speculation . Perhaps we shall find some time that both light - pressure and electric action come into play ...
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angle beam of light black disc black surface blackened calculated circular cloth boards comets convection corpuscles corpuscular theory cubic centimetre deflexion density diameter direction Doppler dynes earth earth's distance effect electric electrified plate emitted energy per cubic ergs exerted experiment Fcap fluorite forward front face give glass gravitation constant gravitative pull greater heat hemisphere incident beam Lebedew light force light-pressure limp cloth magnetic measured medium millionth motion Nernst lamp normal NORTHUMBERLAND AVENUE Note observed torque orbit particles perpendicular Post 8vo PRESSURE OF LIGHT Professor push quartz fibre radiation radiometer action radius refracting repelled repulsion rise in temperature round the sun says shown in fig side sideways solar Solar Constant spinning square centimetre sunlight suppose suspended system tail telescope tion tubes of force UNIVERSITY OF BIRMINGHAM University of Cambridge vacuum velocity of light wave-length waves αρ
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Страница 34 - A flat body exposed to sunlight would experience this pressure on its illuminated side only, and would therefore be repelled from the side on which the light falls. It is probable that a much greater energy of radiation might be obtained by means of the concentrated rays of the electric lamp. Such rays falling on a thin metallic disk, delicately suspended in a vacuum, might perhaps produce an observable mechanical effect.
Страница 82 - The Sun cannot tolerate dust. With the pressure of his light he drives the finest particles altogether away from his system. With his heat he warms the larger particles. They give out this heat again and with it some of that energy which enables them to withstand his attraction. Slowly he draws them to himself and at last they unite with him and end their separate existence.