View
236
Download
3
Category
Preview:
Citation preview
MECHANICAL MECHANICAL WAVESWAVES
WAVE WAVE PROPERTIESPROPERTIES
SOUND…“WHAT?”SOUND…“WHAT?”
SOUNDS OF MUSICSOUNDS OF MUSIC
MIXED BAGMIXED BAG
COOL VIBRATIONSCOOL VIBRATIONS
MECHANICAL WAVES
WAVE PROPERTIES
SOUND…
”WHAT?”
SOUNDS OF MUSIC
MIXED BAG COOL VIBRATIONS
MECHANICAL WAVESMECHANICAL WAVESREQUIRE THIS IN ORDERREQUIRE THIS IN ORDER
TO PROPOGATE TO PROPOGATE
THE TYPE OF WAVE THE TYPE OF WAVE THAT STARTS WITH A THAT STARTS WITH A
SINGLE DISTURBANCE.SINGLE DISTURBANCE.
A WAVE IN WHICH THE A WAVE IN WHICH THE PARTICLES OCILLATE PARTICLES OCILLATE
PARALLEL TO THE PARALLEL TO THE DIRECTION OF DIRECTION OF PROPOGATION.PROPOGATION.
THE DIRECTION THE THE DIRECTION THE RED DOT ON THE WAVE RED DOT ON THE WAVE
IS MOVINGIS MOVING
DOUBLING THE DOUBLING THE AMPLITUDE OF A WAVE AMPLITUDE OF A WAVE WILL HAVE THIS EFFECT WILL HAVE THIS EFFECT
ON ITS ENERGY ON ITS ENERGY
THE TIME IT TAKES FOR THE TIME IT TAKES FOR A WAVE TO COMPLETE A WAVE TO COMPLETE
ONE CYCLEONE CYCLE
THE FREQUENCY OF A THE FREQUENCY OF A WAVE WHOSE PERIOD WAVE WHOSE PERIOD
IS 2 s.IS 2 s.
A COLLISION BETWEEN A COLLISION BETWEEN TWO WAVES THAT TWO WAVES THAT
RESULTS IN A WAVE RESULTS IN A WAVE GREATER THAN ITS GREATER THAN ITS
COMPONENTSCOMPONENTS
THE EFFECT THAT THE EFFECT THAT DOUBLING THE DOUBLING THE
WAVELENGTH HAS ON WAVELENGTH HAS ON THE WAVE SPEEDTHE WAVE SPEED
THE FREQUENCY OF THE FREQUENCY OF THE WATER WAVE THE WATER WAVE
THE PERCEPTION OF THE PERCEPTION OF HOW HIGH OR LOW A HOW HIGH OR LOW A
SOUND APPEARS TO BESOUND APPEARS TO BE
A REFLECTED SOUND WAVEA REFLECTED SOUND WAVE
SOUNDS BELOW 20 HZ SOUNDS BELOW 20 HZ
THE SPEED OF SOUND THE SPEED OF SOUND IN AIR AT 25IN AIR AT 25ooCC
THE MINIMUM DISTANCE A THE MINIMUM DISTANCE A REFLECTIVE SURFACE REFLECTIVE SURFACE
MUST BE IN ORDER FOR MUST BE IN ORDER FOR YOU TO HEAR AN ECHO YOU TO HEAR AN ECHO ON A DAY WHEN IT IS ON A DAY WHEN IT IS
2020ooC.C.
THE TERM THAT THE TERM THAT DESCRIBES THE DESCRIBES THE QUALITY OF THE QUALITY OF THE
SOUND PRODUCED BY SOUND PRODUCED BY AN INSTRUMENTAN INSTRUMENT
THE TYPE OF WAVES THE TYPE OF WAVES PRODUCED IN WIND PRODUCED IN WIND
INSTRUMENTSINSTRUMENTS
THE WAVELENGTH OF THE WAVELENGTH OF THE FIRST HARMONIC THE FIRST HARMONIC
ON A 30 cm VIOLIN ON A 30 cm VIOLIN STRING STRING
THE FREQUENCY THE FREQUENCY EMITTED BY A PIANO EMITTED BY A PIANO
WHEN A TUNER USES A WHEN A TUNER USES A 440 Hz TUNING FORK 440 Hz TUNING FORK AND HEARS 2 BEATS AND HEARS 2 BEATS
PER SECONDPER SECOND
THE FREQUENCY OF THE 5THE FREQUENCY OF THE 5THTH HARMONIC IN A 1 m ORGAN PIPE HARMONIC IN A 1 m ORGAN PIPE
THAT IS OPEN AT BOTH ENDS THAT IS OPEN AT BOTH ENDS WHEN THE AIR WITHIN THE PIPE WHEN THE AIR WITHIN THE PIPE
IS 20IS 20ooCC
THE OBSERVED THE OBSERVED CHANGE IN CHANGE IN
FREQIUENCY DUE TO FREQIUENCY DUE TO THE MOTION OF A THE MOTION OF A
SOUND SOURCE OR SOUND SOURCE OR OBSERVEROBSERVER
WHEN THE FREQUENCY WHEN THE FREQUENCY OF A FORCE APPLIED TO OF A FORCE APPLIED TO
A SYSTEM MATCHES A SYSTEM MATCHES THE NATURAL THE NATURAL
FREQUENCY OF FREQUENCY OF VIBRATION OF A VIBRATION OF A
SYSTEMSYSTEM
THE WAVELENGTH OF THE WAVELENGTH OF THE SECOND THE SECOND
HARMONIC ON A HARMONIC ON A GUITAR STRING OF GUITAR STRING OF
LENGTH L.LENGTH L.
THE MAXIMUM THE MAXIMUM POSSIBLE AMPLITUDE POSSIBLE AMPLITUDE
OF A RESULTANT WAVE OF A RESULTANT WAVE IF WAVES OF 1.0m AND IF WAVES OF 1.0m AND
0.5m AMPLITUDES 0.5m AMPLITUDES INTERACTINTERACT
THE FREQUENCY BEING THE FREQUENCY BEING EMITTED BY THE CAR EMITTED BY THE CAR TRAVELING AT 32 m/s TRAVELING AT 32 m/s WHEN OBSERVER ‘A’ WHEN OBSERVER ‘A’
HEARS A 450 Hz PITCHHEARS A 450 Hz PITCH
BBAA
THE FREQUENCY AT THE FREQUENCY AT WHICH ALL OBJECTS WHICH ALL OBJECTS
VIBRATE WHEN VIBRATE WHEN DISTURBEDDISTURBED
A VIBRATION THAT A VIBRATION THAT CAUSES ANOTHER CAUSES ANOTHER
OBJECT TO VIBRATEOBJECT TO VIBRATE
THE PHENOMENON THE PHENOMENON EXHIBITED IN THE EXHIBITED IN THE
FOLLOWING VIDEO FOLLOWING VIDEO
THE WAVELENGTH OF THE WAVELENGTH OF AN 88 MHz LIGHT WAVE AN 88 MHz LIGHT WAVE IF THE SPEED OF LIGHT IF THE SPEED OF LIGHT
IS 3.0x10IS 3.0x1088 m/s m/s
THE LENGTH OF A THE LENGTH OF A GUITAR STRING WHICH GUITAR STRING WHICH VIBRATES AT A VIBRATES AT A FUNDAMENTAL FUNDAMENTAL FREQUENCY OF 845 Hz FREQUENCY OF 845 Hz IF THE VELOCITY OF IF THE VELOCITY OF WAVES ON THE STRING WAVES ON THE STRING IS 574 m/s IS 574 m/s
DOPPLER EFFECTDOPPLER EFFECT
THE SPEED OF A SOUNDTHE SPEED OF A SOUND SOURCE THAT EMITS A SOURCE THAT EMITS A
200 Hz PITCH IF AN 200 Hz PITCH IF AN OBSERVER HEARS A OBSERVER HEARS A
180 Hz PITCH ON A 25180 Hz PITCH ON A 25ooC C DAYDAY
ANS: 38.4 m/sANS: 38.4 m/s
Recommended