2D and 3D interference

• Resources Structure
• A level
• Physics
• XVII. Mechanical waves
• 85. Diffraction and interference of mechanical waves

• Exam Specifications
• A Level
• AQA GCE AS/A Physics A (5451/6451)
• A2 Module 4 Waves, Fields and Nuclear Energy
• 1. Oscillations and Waves
• Simple harmonic motion: graphical and nalytical treatments
• Free and forced vibration
• Progressive waves
• Longitudinal waves and transverse waves
• Superposition of waves, stationary waves
• Interference
• Diffraction
• AQA GCE AS/A Physics B (5456/6456)
• II. AS Module 2 Waves and Nuclear Physics
• 2. Diffraction and Interference
• Inverse square law for intensity at a distance from a point source of energy
• Intensity proportional to (amplitude of the resultant wave)2
• Stationary waves
• Graphical treatment of standing waves
• Nodes and antinodes
• Stationary waves in strings
• Factors affecting the frequency of the fundamental
• Diffraction
• Diffraction as factor which limits resolution of two objects. Effect of aperture and wavelength on resolution
• Concept of path difference of waves from two sources
• Phase and coherence
• Quantitative treatment of superposition of waves from two sources
• Diffraction grating

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