O Levels Physics (5054)•5054/12/M/J/19
Explanation
Human Hearing Frequency Range Steps:
- Recall that human hearing detects sound waves as vibrations in the 20 Hz to 20 kHz range.
- Evaluate options against this standard: A matches exactly.
- Eliminate B and D for being too narrow or too broad.
- Dismiss C as it specifies the same frequency twice, implying no range.
Why A is correct:
- The audible range for a healthy human ear is defined as approximately 20 Hz (infrasonic bass) to 20 kHz (ultrasonic treble), per standard audiology.
Why the others are wrong:
- B: Too limited (200 Hz–2 kHz), excludes deep bass and high treble humans can hear.
- C: Invalid range (20 Hz to 20 Hz) with zero span, not possible for hearing.
- D: Upper limit (200 kHz) exceeds human capability, entering bat echolocation territory.
Final answer: A
Topic: Sound
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