The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 8
... 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.
... 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 20
... they issue , and against any surface on which they fall . Clerk Maxwell showed that on his theory the pressure thus exerted against a square centimetre by a beam of light was numerically equal to the. 20 PRESSURE OF LIGHT.
... they issue , and against any surface on which they fall . Clerk Maxwell showed that on his theory the pressure thus exerted against a square centimetre by a beam of light was numerically equal to the. 20 PRESSURE OF LIGHT.
Страница 32
... centimetre.1 We can now see what the pressure amounts to . In full sunlight outside our atmosphere the sunlight received on a square centimetre of a black surface would suffice to raise 1 gramme of water about 2.5 ° C. per minute2 or ...
... centimetre.1 We can now see what the pressure amounts to . In full sunlight outside our atmosphere the sunlight received on a square centimetre of a black surface would suffice to raise 1 gramme of water about 2.5 ° C. per minute2 or ...
Страница 33
... sq . cm . in area and 3 × 1010 cm . long , the length that light travels in one second , so that the energy in I cubic centimetre is 175 × 10 ÷ ( 3 × 1010 ) = 5 · 8 / 105 ergs . The pressure exerted by the sunlight on the absorbing ...
... sq . cm . in area and 3 × 1010 cm . long , the length that light travels in one second , so that the energy in I cubic centimetre is 175 × 10 ÷ ( 3 × 1010 ) = 5 · 8 / 105 ergs . The pressure exerted by the sunlight on the absorbing ...
Страница 48
... mm . thick , with a layer of asphaltum also about O'I mm . thick between . To make a disc the as- phaltum was placed on ... square and the plate was suspend- ed in a flask 16 cm . in diameter by a quartz fibre 9 cm . long , from a spring ...
... mm . thick , with a layer of asphaltum also about O'I mm . thick between . To make a disc the as- phaltum was placed on ... square and the plate was suspend- ed in a flask 16 cm . in diameter by a quartz fibre 9 cm . long , from a spring ...
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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.