The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 9
... give some account of the reasoning by which the existence of light - pressure was predicted , and shall then describe the experiments by which it was , many years later , actually detected and measured . I shall then point out some ...
... give some account of the reasoning by which the existence of light - pressure was predicted , and shall then describe the experiments by which it was , many years later , actually detected and measured . I shall then point out some ...
Страница 11
... give it up to the disc when they hit it . This giving up of momentum is pressure . In the eighteenth century , when the Corpuscular Theory of Light flourished , many experiments were made to HOW LIGHT EXERTS PRESSURE II.
... give it up to the disc when they hit it . This giving up of momentum is pressure . In the eighteenth century , when the Corpuscular Theory of Light flourished , many experiments were made to HOW LIGHT EXERTS PRESSURE II.
Страница 14
... give a greater kick back against it than if they rebounded at the same speed . Those which come up on the other cooler side go back with the same velocity with which they came up and do not give an increased kick back . Thus the ...
... give a greater kick back against it than if they rebounded at the same speed . Those which come up on the other cooler side go back with the same velocity with which they came up and do not give an increased kick back . Thus the ...
Страница 31
... give a sharp blow with a hammer to the opposite edge a wave of pressure travels through the table , a wave of momentum , put in by the hammer , which is given up by each part of the table to the next and which finally arrives at the ...
... give a sharp blow with a hammer to the opposite edge a wave of pressure travels through the table , a wave of momentum , put in by the hammer , which is given up by each part of the table to the next and which finally arrives at the ...
Страница 32
... give it to B. B must give up momentum to the reflected waves in the direction B to A , which has the same effect as if it received momentum in the direction A to B. That is , it receives a double dose of momentum and the pressure is ...
... give it to B. B must give up momentum to the reflected waves in the direction B to A , which has the same effect as if it received momentum in the direction A to B. That is , it receives a double dose of momentum and the pressure is ...
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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.