The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 14
... reflected and would therefore press not only in falling on the surface but would give , as it were , another kick back on being reflected , while the light falling on the blackened surface would press only in falling on it , for it is ...
... reflected and would therefore press not only in falling on the surface but would give , as it were , another kick back on being reflected , while the light falling on the blackened surface would press only in falling on it , for it is ...
Страница 32
... reflected waves in the direction B to A , which has the same effect as if it received momentum in the direction A to ... reflection is going on , as when we have only the single beam , the pressure is still equal to the energy per cubic ...
... reflected waves in the direction B to A , which has the same effect as if it received momentum in the direction A to ... reflection is going on , as when we have only the single beam , the pressure is still equal to the energy per cubic ...
Страница 35
... reflected a scale into a telescope to give the position of the arrangement . On cross arms were fixed discs of platinum foil each o'5 cm . in diameter , and each with its centre I cm . from the vertical axis of suspension . The upper ...
... reflected a scale into a telescope to give the position of the arrangement . On cross arms were fixed discs of platinum foil each o'5 cm . in diameter , and each with its centre I cm . from the vertical axis of suspension . The upper ...
Страница 37
... reflected , and the reflected beam was also pressing against the surface . The fraction of light reflected was determined by some subsidiary experiments . Suppose it to be r , then the pressure was P ( 1 + r ) . To test the theory of ...
... reflected , and the reflected beam was also pressing against the surface . The fraction of light reflected was determined by some subsidiary experiments . Suppose it to be r , then the pressure was P ( 1 + r ) . To test the theory of ...
Страница 39
... reflection of a scale could be viewed by a telescope . A beam of light was di- rected on to a disc , and the force which it exerted was measured by the deflection of the scale in the telescope . Nichols and Hull made use of the fact not ...
... reflection of a scale could be viewed by a telescope . A beam of light was di- rected on to a disc , and the force which it exerted was measured by the deflection of the scale in the telescope . Nichols and Hull made use of the fact not ...
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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.