📚 Part 1: Key Concepts and Definitions

1. Define the Doppler effect and explain why it occurs in terms of wave properties.

2. Explain the physical mechanism that produces beats when two waves of slightly different frequencies interfere.

3. Distinguish between constructive and destructive interference, explaining the conditions required for each to occur.

4. For multi-slit diffraction, explain why increasing the number of slits produces sharper, brighter maxima.

🔬 Part 2: Excellence-Level Analysis

5. A police radar operates at 24.15 GHz. Discuss how the Doppler effect allows it to measure vehicle speeds, including the significance of using electromagnetic waves rather than sound waves.

6. Explain why standing waves form only at specific frequencies in a closed pipe or guitar string. Discuss the relationship between wavelength, frequency, and the physical dimensions of the resonating system.

7. Compare and contrast single-slit diffraction with multi-slit diffraction. Discuss how the intensity patterns differ and explain the underlying physics that causes these differences.

🎯 Part 3: Critical Thinking and Applications

8. Discuss why noise-cancelling headphones work effectively for low-frequency sounds but are less effective for high-frequency sounds. Consider wave properties, interference principles, and practical limitations.

9. Evaluate the advantages and limitations of using interferometry in precision measurements (such as LIGO gravitational wave detectors). Explain how small path differences can be detected using wave interference.

10. Analyse why musical instruments produce complex timbres rather than pure tones. Discuss the role of standing waves, harmonics, and the physical structure of instruments in creating characteristic sounds.