. A text book of physics, for the use of students of science and engineering . itthat the ear can detect a difference between the note produced by a tuning-fork and that produced by an organ pipe when both notes have the samepitch ? CHAPTER LIV WAVE MOTION Transmission of sound.—It is obvious that something passes fromthe sounding body to the ear, in order to produce the sensation ofsound. From the motion of the sounding body we should conjecturethat some sort of wave motion ispassing outwards from it. Thatthe air is the medium in whichthis wave motion takes place maybe shown by hanging up an
. A text book of physics, for the use of students of science and engineering . itthat the ear can detect a difference between the note produced by a tuning-fork and that produced by an organ pipe when both notes have the samepitch ? CHAPTER LIV WAVE MOTION Transmission of sound.—It is obvious that something passes fromthe sounding body to the ear, in order to produce the sensation ofsound. From the motion of the sounding body we should conjecturethat some sort of wave motion ispassing outwards from it. Thatthe air is the medium in whichthis wave motion takes place maybe shown by hanging up an electricbell, inside an air-tight bell-jar,and gradually pumping the air out(Fig. 624). As the amount of airin the jar becomes smaller, thesound of the bell gets silence is never attained,because the bell must be sup-ported in some way, and wavespass to some extent through thesupports, even though the bellbe hung by india-rubber , the great reduction in the sound shows that the airis the chief medium for the transmission of sound air pump FIG. 624. -Experiment to show that soundis transmitted by air. All material substances, however, can transmit sound waves ; ifa faint tapping or scratching be made at one end of a long table,the sound can be heard on putting the ear to the other end of thetable, even when the noise is too faint to be heard when the ear isnot placed close to the wood. This shows that the sound waveshave been transmitted through the wood. Transverse waves.—There are two types of wave motion. Inone, the particles of the medium travel in paths at right angles to 680 SOUND chap. the path of the wave, as in the case of waves upon the surface ofwater. In the other, the particles of the medium travel backwardsand forwards in a path whose direction is the same as that in whichthe wave is travelling. The former kind is called a transverse wave,the latter a longitudinal wave. Sound waves are of the longitudinaltype; these ar
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectphysics
