Answer: 3.
- A 1
- B 2
- C 3
- D 4
Correct answer: C. 3
Explanation: Number of loops (half-wavelengths) = L/(lambda/2) = 0.6/0.15 = 4. Wait: lambda=0.3, lambda/2=0.15. Loops=0.6/0.15=4. Actually 0.6/0.15=4 loops. But let me recheck: n half-wavelengths in L: n = 2L/lambda = 2 x 0.6/0.3 = 4 loops. Answer: 4.
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.