Answer: Frequency slightly.
- A Amplitude
- B Frequency slightly
- C Phase
- D Both A and C
Correct answer: B. Frequency slightly
Explanation: Beats are produced when two sound waves of slightly different frequencies interfere, causing alternating loud and soft sounds.
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.