The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 13
... faces retreat from the source of light while the unblackened faces move towards it . At first it was supposed that the action might be directly due to the pressure of light , but it is easy to see that this pressure would produce just ...
... faces retreat from the source of light while the unblackened faces move towards it . At first it was supposed that the action might be directly due to the pressure of light , but it is easy to see that this pressure would produce just ...
Страница 36
... face and then on to the back face of the disc , and taking the difference of the two displacements . For the con- vection currents produced would depend on the rise in temperature of the disc , and also on the difference of temperature ...
... face and then on to the back face of the disc , and taking the difference of the two displacements . For the con- vection currents produced would depend on the rise in temperature of the disc , and also on the difference of temperature ...
Страница 40
... face of the disc . That face would be slightly the hotter , and the radiometer action would join with the light pres- sure in pushing the disc back . The beam was then directed on to the back face of the disc , and the light pressure ...
... face of the disc . That face would be slightly the hotter , and the radiometer action would join with the light pres- sure in pushing the disc back . The beam was then directed on to the back face of the disc , and the light pressure ...
Страница 44
... 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.
... 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
... faces , and it gives out half the energy from each face . The pressures of the issuing radiations are therefore equal and 1 Proc . Roy . Soc . A. , vol . lxxxiii . p . 534 , 1910 . opposite , and produce no effect . We have ...
... faces , and it gives out half the energy from each face . The pressures of the issuing radiations are therefore equal and 1 Proc . Roy . Soc . A. , vol . lxxxiii . p . 534 , 1910 . opposite , and produce no effect . We have ...
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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.