The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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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 21
John Henry Poynting. by a beam of light was numerically equal to the energy in a cubic centimetre of the beam . This , then , is Maxwell's explanation of light- pressure on his electro - magnetic theory . The light consists of tubes of ...
John Henry Poynting. by a beam of light was numerically equal to the energy in a cubic centimetre of the beam . This , then , is Maxwell's explanation of light- pressure on his electro - magnetic theory . The light consists of tubes of ...
Страница 22
... equal small distance EN , as in fig . 7 ( b ) , so that C remains in the original line . Then work is done in pulling D and E out of position , or energy is put into the cord in chang- ing its shape into the zigzag wave form ADCEB . The ...
... equal small distance EN , as in fig . 7 ( b ) , so that C remains in the original line . Then work is done in pulling D and E out of position , or energy is put into the cord in chang- ing its shape into the zigzag wave form ADCEB . The ...
Страница 23
... equal amount , and similarly with H and K. Then D , C , E remain in the original line . The pull ( a ) A F D G C H E B K ( W ) A N B M E ( c ) A B D G K FIG . 7 . required on F in ( c ) is greater than the pull on D in ( b ) , for the ...
... equal amount , and similarly with H and K. Then D , C , E remain in the original line . The pull ( a ) A F D G C H E B K ( W ) A N B M E ( c ) A B D G K FIG . 7 . required on F in ( c ) is greater than the pull on D in ( b ) , for the ...
Страница 24
... equal height and depth are represented . The lower train has half the wave length of the upper train . Let them be supposed to travel at equal speed from left to right . Any particle , such as D , moves up and down as the waves pass by ...
... equal height and depth are represented . The lower train has half the wave length of the upper train . Let them be supposed to travel at equal speed from left to right . Any particle , such as D , moves up and down as the waves pass by ...
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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.