WAVES John Parkinson St. Brendan’s Sixth Form College John Parkinson

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Presentation transcript:

WAVES John Parkinson St. Brendan’s Sixth Form College John Parkinson St. Brendan’s College

THE PRINCIPLE OF SUPERPOSITION If two or more travelling waves are moving through some medium, the resultant wave displacement at any point is the algebraic sum of the individual wave displacements. ADD THEM !!! John Parkinson St. Brendan’s College

+ = John Parkinson St. Brendan’s College

is called INTERFERENCE e.g. between two sources in a Ripple Tank The combination of separate waves in the same region of space to produce a resultant wave is called INTERFERENCE e.g. between two sources in a Ripple Tank SOURCES John Parkinson St. Brendan’s College

+ CONSTRUCTIVE INTERFERENCE These two waves arrive IN PHASE HOW DO THEY ADD UP? + This is called? An antinode. CONSTRUCTIVE INTERFERENCE John Parkinson St. Brendan’s College

These two waves arrive OUT OF PHASE HOW DO THEY ADD UP? + This is called? A node. DESTRUCTIVE INTERFERENCE John Parkinson St. Brendan’s College

CONDITIONS FOR A PERMANENT INTERFERENCE PATTERN The sources must be coherent, i.e. they must be in phase with one another or they must maintain a constant phase relationship. The sources must have the same wavelengths. The sources must have similar amplitudes. The sources must have the same plane of polarization. John Parkinson St. Brendan’s College

S1 and S2 are two coherent sources All points on a wavefront are in phase with one another S1 S2 Waves interfere constructively where wavefronts meet. = antinodal lines Wave Intensity (Light Fringes) Along the nodal lines, destructive interference occurs. Here wavefronts meet out of phase. John Parkinson St. Brendan’s College