The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 24
... represented . The lower train has half the wave length of the upper train . Let them be supposed to travel at equal speed from left to right . Any particle , such as D , moves up and down as the waves pass by it and through an equal ...
... represented . The lower train has half the wave length of the upper train . Let them be supposed to travel at equal speed from left to right . Any particle , such as D , moves up and down as the waves pass by it and through an equal ...
Страница 25
... represent a stationary engine sending out waves of sound forward and backward from C. Let us consider four waves in each direction . These will be of the same length and will travel at the same speed , so that an observer at A will FIG ...
... represent a stationary engine sending out waves of sound forward and backward from C. Let us consider four waves in each direction . These will be of the same length and will travel at the same speed , so that an observer at A will FIG ...
Страница 43
... represents an arrangement which I have found to work very well . A silvered disc S and a blackened disc B are fixed inside a thin mica rectangular box suspended by a quartz fibre in a metal case with plate glass front ; w is a side ...
... represents an arrangement which I have found to work very well . A silvered disc S and a blackened disc B are fixed inside a thin mica rectangular box suspended by a quartz fibre in a metal case with plate glass front ; w is a side ...
Страница 53
... represent the momentum which it brings in one second . Resolve AB into NB perpendicular to the surface and TB along it . If S cannot be pushed back , NB will have no visible effect . But if S can slide on its own plane TB will push it ...
... represent the momentum which it brings in one second . Resolve AB into NB perpendicular to the surface and TB along it . If S cannot be pushed back , NB will have no visible effect . But if S can slide on its own plane TB will push it ...
Страница 66
... represented in the figures was enclosed in an outer gas - tight case . If the piston had fitted the cylindrical cavity exactly and had been entirely free from friction , when the beam passed through G there would have been a difference ...
... represented in the figures was enclosed in an outer gas - tight case . If the piston had fitted the cylindrical cavity exactly and had been entirely free from friction , when the beam passed through G there would have been a difference ...
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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.