The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 15
... length instead of being yards or miles from crest to crest . He showed , too , that such waves should exert a pressure , but just half that exerted according to the discarded Corpuscular Theory . He calculated with the data he took that ...
... length instead of being yards or miles from crest to crest . He showed , too , that such waves should exert a pressure , but just half that exerted according to the discarded Corpuscular Theory . He calculated with the data he took that ...
Страница 19
... length of a wave includes two oppositely affected halves , i.e. stretches from A to C , and for ordinary light a wave is somewhere about a fifty - thousandth of an inch long . These waves are travelling on , say from left to right , and ...
... length of a wave includes two oppositely affected halves , i.e. stretches from A to C , and for ordinary light a wave is somewhere about a fifty - thousandth of an inch long . These waves are travelling on , say from left to right , and ...
Страница 22
... length we have to put more energy into them , somewhat as we have to put more energy into the spiral spring when we crush it up . The ends of the spring are pressing outwards , and if we compress it we do work against the outward ...
... length we have to put more energy into them , somewhat as we have to put more energy into the spiral spring when we crush it up . The ends of the spring are pressing outwards , and if we compress it we do work against the outward ...
Страница 23
... length AB . Let F be drawn up through FP = DM in ( b ) , and let G be drawn down by an equal amount , and similarly with H and K. Then D , C , E remain in the original line . The pull ( a ) A F D G C H E B K ( W ) A N B M E ( c ) ...
... length AB . Let F be drawn up through FP = DM in ( b ) , and let G be drawn down by an equal amount , and similarly with H and K. Then D , C , E remain in the original line . The pull ( a ) A F D G C H E B K ( W ) A N B M E ( c ) ...
Страница 24
... length to change the shape . It is easily seen that with three waves in the same length , we should have nine times as much energy , and generally the energy in given length for waves of the same height is in inverse proportion to the ...
... length to change the shape . It is easily seen that with three waves in the same length , we should have nine times as much energy , and generally the energy in given length for waves of the same height is in inverse proportion to the ...
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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.