Answer: Multiple reflections of sound in enclosed space.
- A Multiple reflections of sound in enclosed space
- B A single distinct echo returning from a distant reflecting object
- C The Doppler effect shifting frequency due to relative motion
- D Diffraction of sound bending around obstacles in the room
Correct answer: A. Multiple reflections of sound in enclosed space
Explanation: Reverberation is the persistence of sound in an enclosed space due to multiple reflections from walls.
A standing wave forms from two identical waves travelling in opposite directions and interfering; nodes (always zero displacement) and antinodes (maximum displacement) stay fixed in place, unlike a travelling wave where the whole pattern moves.
Concept context
Wave types, superposition, standing waves, Doppler effect, and sound intensity.