The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 12
... known the Principle of the Conservation of Energy , they would have been able to calculate the value of the pressure , which they were looking for , and it would have worked out on their false theory to double the actual value we now ...
... known the Principle of the Conservation of Energy , they would have been able to calculate the value of the pressure , which they were looking for , and it would have worked out on their false theory to double the actual value we now ...
Страница 35
... known size and weight and when unloaded -the method always used to find the force needed to twist a fibre or wire through any angle . H FIG . 13 . With the high degree of exhaustion used there was probably no bodily convection of the ...
... known size and weight and when unloaded -the method always used to find the force needed to twist a fibre or wire through any angle . H FIG . 13 . With the high degree of exhaustion used there was probably no bodily convection of the ...
Страница 37
... to measure the energy E in a cubic centimetre of the beam . One way in which this was done is illustrated in fig . 14. A blackened copper block C , of known size and weight , had a small hole EXPERIMENTS ON PRESSURE OF LIGHT 37.
... to measure the energy E in a cubic centimetre of the beam . One way in which this was done is illustrated in fig . 14. A blackened copper block C , of known size and weight , had a small hole EXPERIMENTS ON PRESSURE OF LIGHT 37.
Страница 38
John Henry Poynting. of known size and weight , had a small hole bored in it , and a small thermometer was inserted . A screen with a hole D , just the size of a disc , was placed in front , and the beam was directed on to D , and ...
John Henry Poynting. of known size and weight , had a small hole bored in it , and a small thermometer was inserted . A screen with a hole D , just the size of a disc , was placed in front , and the beam was directed on to D , and ...
Страница 40
... re- flecting power of the silver was determined , and its slight defect from total reflection was allowed for . To determine the energy in the beam it was allowed to fall on a blackened silver disc of known 40 PRESSURE OF LIGHT.
... re- flecting power of the silver was determined , and its slight defect from total reflection was allowed for . To determine the energy in the beam it was allowed to fall on a blackened silver disc of known 40 PRESSURE OF LIGHT.
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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.