The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 11
... shown . Pour some fine shot into the funnel , and they run down the pipe and bombard the disc , pressing it back . The shot acquire momentum . They carry this momentum and give it up to the disc when they hit it . This giving up of ...
... shown . Pour some fine shot into the funnel , and they run down the pipe and bombard the disc , pressing it back . The shot acquire momentum . They carry this momentum and give it up to the disc when they hit it . This giving up of ...
Страница 28
... 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 length ABC . In the lower part of the 28 PRESSURE OF LIGHT.
... 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 length ABC . In the lower part of the 28 PRESSURE OF LIGHT.
Страница 34
... , § 793 . 2 Rapports , vol . 2 , p . 133. A fuller account is given in Ann . du Physik , vi . 433 , Nov. 1901 . HH T H Ι Σ that shown in fig . 34 EXPERIMENTS ON THE PRESSURE OF LIGHT FALLING PERPENDICULARLY ON A SURFACE.
... , § 793 . 2 Rapports , vol . 2 , p . 133. A fuller account is given in Ann . du Physik , vi . 433 , Nov. 1901 . HH T H Ι Σ that shown in fig . 34 EXPERIMENTS ON THE PRESSURE OF LIGHT FALLING PERPENDICULARLY ON A SURFACE.
Страница 35
John Henry Poynting. HH T H Ι Σ that shown in fig . 13 was used . This was suspended by a fine glass thread TH . was a glass rod to which was fixed a mirror M , which reflected a scale into a telescope to give the position of the ...
John Henry Poynting. HH T H Ι Σ that shown in fig . 13 was used . This was suspended by a fine glass thread TH . was a glass rod to which was fixed a mirror M , which reflected a scale into a telescope to give the position of the ...
Страница 41
... shown in fig . 16. The radiometer action was then eliminated . For if a molecule gave an extra kick back against the absorbing disc , it rushed forward and gave an extra kick 1 Physical Review , XX . May 1905 . forward against the front ...
... shown in fig . 16. The radiometer action was then eliminated . For if a molecule gave an extra kick back against the absorbing disc , it rushed forward and gave an extra kick 1 Physical Review , XX . May 1905 . forward against the front ...
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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.