Elementary Treatise on Natural Philosophy, Volumen4D. Appleton, 1891 |
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Página 879
... traverses , in unit time , any closed surface described about the source , must be equal to the energy which the source emits in unit time . Hence , by the reasoning which we employed in the case of radiant heat ( § 465 ) , it follows ...
... traverses , in unit time , any closed surface described about the source , must be equal to the energy which the source emits in unit time . Hence , by the reasoning which we employed in the case of radiant heat ( § 465 ) , it follows ...
Página 880
... traversing a moderate distance . For example , the flash of a gun at the distance of a few hundred yards is seen some time before the report is heard . The interval between the two impressions may be regarded as representing the time ...
... traversing a moderate distance . For example , the flash of a gun at the distance of a few hundred yards is seen some time before the report is heard . The interval between the two impressions may be regarded as representing the time ...
Página 889
... traversing the same mat- ter , the actual motion of each particle of the matter is the resultant of the mo- tions due to each system separately . When these 5 2 Fig . 613. -Ear - trumpets . Fig . 612 . Speaking - trumpet . component ...
... traversing the same mat- ter , the actual motion of each particle of the matter is the resultant of the mo- tions due to each system separately . When these 5 2 Fig . 613. -Ear - trumpets . Fig . 612 . Speaking - trumpet . component ...
Página 890
... traversing the same matter in the same direction , their phases must either be the same , or must everywhere differ by the same amount . If they are the same , the amplitude of vibration for each particle will be double of that due to ...
... traversing the same matter in the same direction , their phases must either be the same , or must everywhere differ by the same amount . If they are the same , the amplitude of vibration for each particle will be double of that due to ...
Página 893
... traverses in its motion per unit time is ( v – u ) p . As there is no permanent transfer of air in either direction ... traversing the lamina is and in this v time the velocity of the lamina changes by the amount du , since the velocity ...
... traverses in its motion per unit time is ( v – u ) p . As there is no permanent transfer of air in either direction ... traversing the lamina is and in this v time the velocity of the lamina changes by the amount du , since the velocity ...
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Términos y frases comunes
achromatic analyser angle of incidence beam body bright lines called centimetres centre coincidence colours concave mirror conjugate foci convex convex lens crystal curvature denote diameter direction distance employed equal experiment eye-piece flame focal length frequency of vibration fundamental note glass harmonics Hence Iceland-spar incident ray index of refraction interval inverted law of sines lens lenses luminous point magnifying power medium metres minimum deviation nearly node normal number of vibrations object object-glass oblique observer obtained octave optical ordinary parallel particles pencil perpendicular pipe pitch placed plane mirror plate polarization portion position principal axis principal focus prism produced propagation radius rarefaction ratio reflected rays refrangibility represented retina rotation screen seen side slit solar spectra spectrum spherical string subtends surface telescope tion tone traversing tube undulation velocity of sound vertical vibrations vibrations per second violet virtual image visual angle wave-front wave-length waves