The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 29
... temperature of the source , which is the same in the two cases . We must suppose , too , that the energy given out by the light sources is the same in the two cases . But in the latter case the energy in the wave is twice as great in ...
... temperature of the source , which is the same in the two cases . We must suppose , too , that the energy given out by the light sources is the same in the two cases . But in the latter case the energy in the wave is twice as great in ...
Страница 36
... temperature of the two sides . The rise in temperature would be very considerable , but with the very thin discs used the difference of temperature of the two sides would be negligibly small . The convective action would , therefore ...
... temperature of the two sides . The rise in temperature would be very considerable , but with the very thin discs used the difference of temperature of the two sides would be negligibly small . The convective action would , therefore ...
Страница 37
... temperature on the two sides , and give no radiometer action . In this way , by obser- vations with the same beam , first on the thicker , and then on the thinner black disc , the radiometer action was eliminated . On the bright discs ...
... temperature on the two sides , and give no radiometer action . In this way , by obser- vations with the same beam , first on the thicker , and then on the thinner black disc , the radiometer action was eliminated . On the bright discs ...
Страница 38
... temperature in a given time showed how much energy the beam brought up in that time , and so the energy brought up in a second was determined . If V is the velocity of light , and if H is the heat developed in C per second , measured in ...
... temperature in a given time showed how much energy the beam brought up in that time , and so the energy brought up in a second was determined . If V is the velocity of light , and if H is the heat developed in C per second , measured in ...
Страница 41
... temperature was determined by a thermo - electric method , into which we shall not enter . The rise in a given time gave the heat developed , and thence the energy per cubic centimetre of the beam could be determined . Allowance was ...
... temperature was determined by a thermo - electric method , into which we shall not enter . The rise in a given time gave the heat developed , and thence the energy per cubic centimetre of the beam could be determined . Allowance was ...
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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.