An Elementary Handbook of PhysicsBlackwood, 1871 - 389 páginas |
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Página 17
... usually double . What is a sound ? We say that we hear with our ears ; but what is hearing ? What do we hear ? How do we hear it ? Just as we can see only when light comes in actual contact with our eyes , so we can hear only when the ...
... usually double . What is a sound ? We say that we hear with our ears ; but what is hearing ? What do we hear ? How do we hear it ? Just as we can see only when light comes in actual contact with our eyes , so we can hear only when the ...
Página 21
... usually described to be the case . ( 5. ) Intensity of Sound . - This depends entirely upon the force with which the sound - wave impinges upon the ear , and this depends entirely upon the original force which caused the sound - wave ...
... usually described to be the case . ( 5. ) Intensity of Sound . - This depends entirely upon the force with which the sound - wave impinges upon the ear , and this depends entirely upon the original force which caused the sound - wave ...
Página 33
... usually also decreases it by decreasing the elasticity . Water at 15 ° C. conveys sound at 4714 feet per second ; at 30 ° C. it conveys it 5013 feet . Here the increase , owing to decreased density , is greater than the decrease , owing ...
... usually also decreases it by decreasing the elasticity . Water at 15 ° C. conveys sound at 4714 feet per second ; at 30 ° C. it conveys it 5013 feet . Here the increase , owing to decreased density , is greater than the decrease , owing ...
Página 44
... usually produced by a violin , but the E F G A D BC L E BC D E F G A A EF G A BC D D G A B D E F G Fig . 33 . arrangement of the four strings gives greater pur- ity of tone , and greater practical convenience . Greater purity of tone ...
... usually produced by a violin , but the E F G A D BC L E BC D E F G A A EF G A BC D D G A B D E F G Fig . 33 . arrangement of the four strings gives greater pur- ity of tone , and greater practical convenience . Greater purity of tone ...
Página 46
... usually called C - written in music as I may now divide this string in many ways , or ( what has the same result ) take other strings of the same thickness , density , and tension , but shorter in various ratios . From the whole string ...
... usually called C - written in music as I may now divide this string in many ways , or ( what has the same result ) take other strings of the same thickness , density , and tension , but shorter in various ratios . From the whole string ...
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Palavras e frases frequentes
absorbed acid action amount of heat angle antimony apparatus arrangement atoms attraction ball battery becomes bismuth body carbon chemical coil colour conducting conductor connection continuous copper current passes decomposed decreases density direction distance earth effect electric current electric force electrified electroscope equal ether excited galvanic galvanometer gases given glass greater hydrogen inches increase latent heat length less Leyden jar light falling light passing liquid magnet magnetised means measure medium mercury metal mirror motion move needle negative nitric acid number of vibrations ordinary oxygen parallel particles passage piece plate platinum polarised pole position prism produce quantity radiation ray of light refraction repulsion result side soft iron solid sound sound-wave spark specific heat spectrum string substance sulphuric acid surface temperature theory thickness tion tricity tube velocity velocity of sound weight whole wire zinc
Passagens conhecidas
Página 54 - ... the angle of reflection is always equal to the angle of incidence, the image for any point can be seen only in the reflected ray prolonged.
Página 391 - A Manual of Palaeontology, for the Use of Students. With a General Introduction on the Principles of Palaeontology.
Página 292 - ... before incidence. Hence the reflected rays, on being produced back, will meet at a point as far behind the reflector as the point of the object is in front of it.