What describes the frequency shift of a wave relative to a moving observer? 👤 By TheQuizWire ✅ Fact Checked 📊 Difficulty Medium 📅 Last Updated 01 Dec 2025 A. Heisenberg Principle B. Photoelectric Effect C. Doppler Effect D. Refraction Check Answer 💡 Explanation: The Doppler Effect explains the change in pitch (frequency) of a sound as its source moves past an observer. 📚 Topics: Physics Science 🎯 Exams: CSS GEN NTS PMS
