The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 11
... 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 suspending the arm by a fine wire , so that it is free to turn round as in fig . I. Now ...
... 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 suspending the arm by a fine wire , so that it is free to turn round as in fig . I. Now ...
Страница 15
... suppose that the waves could press , and so experiments to detect light - pressure ceased for nearly a century . In 1873 Clerk Maxwell put forth the Electro- magnetic Theory of Light , a theory now universally accepted . On this theory ...
... suppose that the waves could press , and so experiments to detect light - pressure ceased for nearly a century . In 1873 Clerk Maxwell put forth the Electro- magnetic Theory of Light , a theory now universally accepted . On this theory ...
Страница 16
... suppose that the air or medium between the two surfaces , electrified respectively positively and negatively , is modified . Perhaps the atoms join hands and form atomic chains stretching from surface to surface , and these chains tend ...
... suppose that the air or medium between the two surfaces , electrified respectively positively and negatively , is modified . Perhaps the atoms join hands and form atomic chains stretching from surface to surface , and these chains tend ...
Страница 22
... suppose of india - rubber . Let AB , fig . 7 ( a ) , be the cord , stretched to some extent . Let C be the middle point , and let D and E be the middle points of AC and CB . Suppose that D is drawn up a small distance DM , and that E is ...
... suppose of india - rubber . Let AB , fig . 7 ( a ) , be the cord , stretched to some extent . Let C be the middle point , and let D and E be the middle points of AC and CB . Suppose that D is drawn up a small distance DM , and that E is ...
Страница 23
... suppose , the displacement is only small , the slope in ( c ) is double that in ( b ) and the pull along FP is double that along DM . Then the work done at Fin ( c ) is double that done at D in ( b ) . But in ( c ) there are twice as ...
... suppose , the displacement is only small , the slope in ( c ) is double that in ( b ) and the pull along FP is double that along DM . Then the work done at Fin ( c ) is double that done at D in ( b ) . But in ( c ) there are twice as ...
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Често срещани думи и фрази
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.