Answer: 20 Hz to 20000 Hz.
- A 20 Hz to 20000 Hz
- B 20 kHz to 200 kHz
- C 2 Hz to 200 Hz
- D 0 Hz to 2000 Hz
Correct answer: A. 20 Hz to 20000 Hz
Explanation: Humans can typically hear sound from about 20 Hz to 20000 Hz. Below this is infrasonic and above it is ultrasonic.
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.