The Pressure of LightSociety for Promoting Christian Knowledge, 1910 - 103 страници |
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Страница 12
... 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 know it to have . Even this double value is ...
... 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 know it to have . Even this double value is ...
Страница 14
... energy from it and go back faster than they came up , and so give a greater kick back against it than if they rebounded at the same speed . Those which come up on the other cooler side go back with the same velocity with which they came ...
... energy from it and go back faster than they came up , and so give a greater kick back against it than if they rebounded at the same speed . Those which come up on the other cooler side go back with the same velocity with which they came ...
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 ... energy . If we HOW LIGHT EXERTS PRESSURE 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 ... energy . If we HOW LIGHT EXERTS PRESSURE 21.
Страница 22
... energy into them , somewhat as we have to put more energy into the spiral spring when we crush it up . The ends of the spring are pressing outwards , and if we compress it we do work against the outward pressure , and so we put extra ...
... energy into them , somewhat as we have to put more energy into the spiral spring when we crush it up . The ends of the spring are pressing outwards , and if we compress it we do work against the outward pressure , and so we put extra ...
Страница 24
... energy in the same length to change the shape . It is easily seen that with three waves in the same length , we should have nine times as much energy , and generally the energy in given length for waves of the same height is in inverse ...
... energy in the same length to change the shape . It is easily seen that with three waves in the same length , we should have nine times as much energy , and generally the energy in given length for waves of the same height is in inverse ...
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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.