The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 14
... velocity with which they came up and do not give an increased kick back . Thus the residual air presses more against the black surface and the vanes spin round . For reasons which we cannot enter into here , this " radiometer action ...
... velocity with which they came up and do not give an increased kick back . Thus the residual air presses more against the black surface and the vanes spin round . For reasons which we cannot enter into here , this " radiometer action ...
Страница 24
... an equal excursion in each case . But the particle has to make twice as many excursions in the same time in the lower train , and must therefore move with an average : velocity twice as great as that of a particle in 24 PRESSURE OF LIGHT.
... an equal excursion in each case . But the particle has to make twice as many excursions in the same time in the lower train , and must therefore move with an average : velocity twice as great as that of a particle in 24 PRESSURE OF LIGHT.
Страница 25
John Henry Poynting. velocity twice as great as that of a particle in the upper train . But the energy of motion is propor- tional to the square of the velocity . Then the energy in the lower train is four times as great as that in the ...
John Henry Poynting. velocity twice as great as that of a particle in the upper train . But the energy of motion is propor- tional to the square of the velocity . Then the energy in the lower train is four times as great as that in the ...
Страница 27
... velocity of the waves is not altered by the travel of the engine . But the fourth wave will have just issued when the engine is at D , so that in the direction of motion the four waves are crushed up into the shorter length AD and the ...
... velocity of the waves is not altered by the travel of the engine . But the fourth wave will have just issued when the engine is at D , so that in the direction of motion the four waves are crushed up into the shorter length AD and the ...
Страница 38
... velocity of light , and if H is the heat developed in C per second , measured in ergs , then H is the energy in length V of the beam , and H / V is that in a length of one centimetre . The force on a black disc , the size of the hole D ...
... velocity of light , and if H is the heat developed in C per second , measured in ergs , then H is the energy in length V of the beam , and H / V is that in a length of one centimetre . The force on a black disc , the size of the hole D ...
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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.