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 21
... moving particles on the old corpuscular theory . This was first pointed out by Bartoli in 1875 , and the proof was put in a precise and simple form by Sir Joseph Larmor . The fundamental idea of the proof is , that a train of waves is ...
... moving particles on the old corpuscular theory . This was first pointed out by Bartoli in 1875 , and the proof was put in a precise and simple form by Sir Joseph Larmor . The fundamental idea of the proof is , that a train of waves is ...
Страница 25
... moving , the length of the waves is altered , shortened if it is following them up , lengthened if it is moving backwards from them . This effect was first pointed out by Doppler in 1842. It is easily observed in the sound emitted by a ...
... moving , the length of the waves is altered , shortened if it is following them up , lengthened if it is moving backwards from them . This effect was first pointed out by Doppler in 1842. It is easily observed in the sound emitted by a ...
Страница 27
... moving round the circumference of the circle . A hearer outside the circle notes a rise in pitch as the pipe approaches him and a fall as it recedes , though to the experi- menter the pitch is the same all the time . Another interesting ...
... moving round the circumference of the circle . A hearer outside the circle notes a rise in pitch as the pipe approaches him and a fall as it recedes , though to the experi- menter the pitch is the same all the time . Another interesting ...
Страница 28
... moving fork are shortened and he receives more per second . Though the forks are still emitting the same number of waves per second the hearer is receiving more from one than from the other : the two notes to him are not the same and ...
... moving fork are shortened and he receives more per second . Though the forks are still emitting the same number of waves per second the hearer is receiving more from one than from the other : the two notes to him are not the same and ...
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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.