Answer: 200 Hz.
- A 100 Hz
- B 150 Hz
- C 200 Hz
- D 300 Hz
Correct answer: C. 200 Hz
Explanation: Second harmonic = 2 x fundamental = 2 x 100 = 200 Hz.
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.