The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 28
... radiation of the light kind , whether it is within the range sensible by the eye or not . Consider the cases shown in fig . 10 . In the upper part of the figure suppose that the source A is at rest and that it is emitting waves of the ...
... radiation of the light kind , whether it is within the range sensible by the eye or not . Consider the cases shown in fig . 10 . In the upper part of the figure suppose that the source A is at rest and that it is emitting waves of the ...
Страница 34
... radiation might be obtained by means of the concentrated rays of the electric lamp . Such rays falling on a thin metallic disc , delicately suspended in a vacuum , might perhaps produce an observable mechanical effect . " 1 Twenty ...
... radiation might be obtained by means of the concentrated rays of the electric lamp . Such rays falling on a thin metallic disc , delicately suspended in a vacuum , might perhaps produce an observable mechanical effect . " 1 Twenty ...
Страница 44
... radiation almost altogether by the black surface , and hardly at all by the silver sur- face . The black surface should be pushed back by 44 EXPERIMENTS ON THE PRESSURE OF LIGHT AGAINST THE SOURCE FROM WHICH ISSUES THE RECOIL FROM LIGHT.
... radiation almost altogether by the black surface , and hardly at all by the silver sur- face . The black surface should be pushed back by 44 EXPERIMENTS ON THE PRESSURE OF LIGHT AGAINST THE SOURCE FROM WHICH ISSUES THE RECOIL FROM LIGHT.
Страница 45
... radiation . But the experimental difficulties in the way of this direct method appear to be quite insuperable . Dr ... radiation was equal to the energy absorbed . The effect was therefore due in part to the pressure of the incoming ...
... radiation . But the experimental difficulties in the way of this direct method appear to be quite insuperable . Dr ... radiation was equal to the energy absorbed . The effect was therefore due in part to the pressure of the incoming ...
Страница 46
... radiation which it emits is equal to that of the radiation which it receives . The back surface being a perfect reflector does not send out any radiation . All the energy pours out from the front surface . If it were given out along the ...
... radiation which it emits is equal to that of the radiation which it receives . The back surface being a perfect reflector does not send out any radiation . All the energy pours out from the front surface . If it were given out along 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.