Answer: v = f x lambda.
- A v = f + lambda
- B v = f x lambda
- C v = f / lambda
- D v = lambda / f
Correct answer: B. v = f x lambda
Explanation: v = f x lambda (speed = frequency x wavelength). This is the fundamental wave equation.
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.