The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 8
... OF SUNLIGHT 92 VII THE RESISTING FORCE ON A SPHERE MOVING ROUND THE SUN AND RADIATING R PER SQ . CM . PER SECOND , AND THE REDUCTION OF ITS ORBIT ROUND THE SUN • 95 PRESSURE OF LIGHT I HOW LIGHT EXERTS PRESSURE WHEN we viii CONTENTS.
... OF SUNLIGHT 92 VII THE RESISTING FORCE ON A SPHERE MOVING ROUND THE SUN AND RADIATING R PER SQ . CM . PER SECOND , AND THE REDUCTION OF ITS ORBIT ROUND THE SUN • 95 PRESSURE OF LIGHT I HOW LIGHT EXERTS PRESSURE WHEN we viii CONTENTS.
Страница 76
... orbit instead of the simple circular orbit which we have supposed . If the orbit is elliptical , another effect of light- pressure comes in , which we may term the " Doppler Reception Effect . " Let fig . 33 represent the orbit . As a ...
... orbit instead of the simple circular orbit which we have supposed . If the orbit is elliptical , another effect of light- pressure comes in , which we may term the " Doppler Reception Effect . " Let fig . 33 represent the orbit . As a ...
Страница 77
... orbit . We may regard these forces , due to excess and defect of P Q A FIG . 33 . momentum received , as extra forces superposed on the inverse square force . At such a point as P the extra force is along SP and is a resistance to the ...
... orbit . We may regard these forces , due to excess and defect of P Q A FIG . 33 . momentum received , as extra forces superposed on the inverse square force . At such a point as P the extra force is along SP and is a resistance to the ...
Страница 80
... orbit . Calculation shows that a sphere of the density of the earth , black so that it absorbs all the sun's radiation falling on it , and 1 cm . radius , say the the size of a marble , will fall in towards the sun , if at the earth's ...
... orbit . Calculation shows that a sphere of the density of the earth , black so that it absorbs all the sun's radiation falling on it , and 1 cm . radius , say the the size of a marble , will fall in towards the sun , if at the earth's ...
Страница 81
... orbit more circular . 3. A drawing in , in a spiral , ending sooner or later in the sun . On bodies as large as the ... orbit . Then a tendency for all the particles to move in F less and less elliptic orbits , the smaller particles ...
... orbit more circular . 3. A drawing in , in a spiral , ending sooner or later in the sun . On bodies as large as the ... orbit . Then a tendency for all the particles to move in F less and less elliptic orbits , the smaller particles ...
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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.