Answer: Wavelength and speed.
- A Frequency
- B Wavelength and speed
- C Frequency and wavelength
- D Amplitude only
Correct answer: B. Wavelength and speed
Explanation: When sound refracts (changes medium), speed changes. Since frequency must be conserved, wavelength also changes. Frequency stays same.
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.