Answer: Longitudinal.
- A Transverse
- B Longitudinal
- C Electromagnetic
- D Stationary
Correct answer: B. Longitudinal
Explanation: Sound waves are longitudinal mechanical waves: particles vibrate parallel to the direction of wave propagation.
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.