Lynde, Carleton John, b. 1872 · New York, Macmillan · leaf 292
sion at regular in-tervals. If the sounds at regular intervalsare less frequent than 40 per second, theyare not musical and are classed as noise.The frequencies used in music are fromabout 40 to 4000 vibrations per second. The pitch of a note depends on thenumber of waves per second. — This canbe… … 278 PHYSICS OF THE HOUSEHOLD through each hole as it passes the tube. It is found that as thedisk is revolved more and more rapidly the pitch of the note pro-duced becomes higher. Since a wave is started by each puffand the greater the number of revolutions per second the greaterthe number of puffs…
Physics · Home Economics
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