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THEORY OF VIBRATIONS
VIBRATIONS IN AN EXTENDED MEDIUM WAVE MOTION
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absorption acoustic alternating alternating current ampliﬁer amplitude angle antinode applied axis circuit condenser curve damping decibels deﬁnite density diameter diaphragm diffraction direction disc displacement distance effect elastic electrical electromagnetic equation ﬁeld ﬁlm ﬁlter ﬁne ﬁrst ﬁxed ﬂame ﬂow ﬂuctuations fork harmonic Helmholtz resonator high frequency hydrophone increase indicated inﬂuence length liquid longitudinal longitudinal waves magnetostriction maximum means measured mechanical medium method metres/sec microphone motion nodes noise observed obtained optical oscillations oscillograph particles phase Phil Phys piezo-electric pipe plane waves plate pressure Proc produced quartz radiation range ratio Rayleigh receiver record reﬂected reﬂector resonance Rochelle salt sensitive shown in ﬁg simple sound energy sound intensity sound waves source of sound spherical stationary waves string surface temperature theory tion tone transmission transmitted transverse transverse waves tube tuning-fork varying velocity of sound vibrations viscosity wave-front wave-length whilst wire zero