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Waves
G482 Waves
22
Physics
02/27/2009

Term
 Displacement,
Definition
 DISTANCE A PARTICLE IN A PARTICULAR MEDIUM IS FROM ITS EQUILIBRIUM POSITION (x)
Term
 Amplitude
Definition
 MAXIMUM DISPLACEMENT FROM EQM. POSITION (A)
Term
 Period
Definition
 TIME TAKEN FOR A PARTICLE TO MAKE ONE COMPLETE OSCILLATION - OR - TIME IT TAKES FOR ON COMPLETE WAVE TO PASS A FIXED POINT (T)
Term
 Phase Difference
Definition
 THE AMOUNT BY WHICH TWO OSCILLATING PARTICLES OR WAVES ARE OUT OF STEP. (PHI)
Term
 Frequency
Definition
 NUMBER OF VIBRATIONS PER SECOND OF A PARTICULAR PARTICLE - OR - NUMBER OF WAVES PASSING A FIXED POINT PER SECOND (f IN Hz)
Term
 Wavelength
Definition
 MINIMUM DISTANCE BETWEEN TWO PARTICLES THAT ARE OSCILLATING IN PHASE - OR - DISTANCE BETWEEN A POINT ON THE WAVE AND THE SAME CORRESPONDING POINT ON THE NEXT SUCCESSIVE WAVE.
Term
 The Wave Equation
Definition
 v = f x lambda
Term
 Longitudinal Waves
Definition
 PARTICLES VIBRATE PARALLEL TO THE DIRECTION OF PROPAGATION
Term
 Transverse Waves
Definition
 PARTICLES VIBRATE PERPENDICULAR TO THE DIRECTION OF PROPAGATION
Term
 Superposition
Definition
 WHEN TWO OR MORE WAVES OVERLAP AT A POINT, THE RESULTANT DISPLACEMENT IS THE VECTOR SUM OF THE DISPLACEMENTS OF THE ORIGINAL WAVES.
Term
 Polarised
Definition
 ALL PARTICLES ARE OSCILLATING IN THE SAME PLANE(OR FOR EM THE FIELDS DON'T ALTER THEIR PLANE OF OSCILLATION)
Term
 Coherence
Definition
 WAVES ARE COHERENT IF THEY HAVE A CONSTANT PHASE RELATTIONSHIP
Term
 Path Difference
Definition
 WAVES FROM TWO SOURCES MEET AT ONE POINT HAVING TRAVELLED DIFFERENT DISTANCES
Term
 Constructive interference
Definition
 WAVES MEET WITH A PATH DIFFERENCE OF ZERO OR n x lambda (n=INTEGER) WVES ARE IN PHASE AND RESULT IN MAXIMA
Term
 Destructive interference
Definition
 AN ODD NUMBER OF HALF WAVELENGTHS RESULTS IN ANNULMENT (MINIMAS)
Term
 Standing Waves
Definition
 TWO PROGRESSIVE WAVES OF THE SAME FREQUENCY, VELOCITY AND SIMILAR AMPLITUDE PASS OVER ONE ANOTHER IN OPPOSITE DIRECTIONS.
Term
 Node
Definition
 POINT ON A STANDING WAVE WITH NO AMPLITUDE (DISTANCE BETWEEN NODES = 1/2 WAVELENGTH)
Term
 Antinode
Definition
 POINT AT WHICH A STANDING WAVE OSCILLATES WITH MAXIMUM AMPLITUDE
Term
 Diffraction
Definition
 SPREADING OF WAVES INTO THE GEOMETRIC SHADOW WHEN PASSING THROUGH A SLIT (OR OBSTACLE) WHOS SIZE IS COMPARABLE TO THE WAVELENGTH.
Term
 Malus' law
Definition
 INTENSITY OF PLANE POLARISED LIGHT PASSING THROUGH A POLARISING FILTER IS PROPORTIONAL TO cos^2 ANGLE OF ROTATION OF THE FILTER RELATIVE TO THE PLANE OF POLARISATION.
Term
 Fundamental Mode of Vibration
Definition
 THE LOWEST FREQUENCY IN A HARMONIC SERIES WHERE A STATIONARY WAVE IS FORMED.
Term
 Harmonics
Definition
 WHOLE NUMBER MULTIPLES OF THE FUNDAMENTAL FREQUENCY OF A STANDING WAVE.
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