The range of sound

 👍 Let’s classify the range of sound step by step. 🕪🕩

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1. By Frequency (Hz = cycles per second)

Sound is usually divided into three main ranges:

• Infrasound: below 20 Hz

  • Too low for humans to hear.

  • Elephants and whales use these sounds.

• Audible sound: 20 Hz – 20,000 Hz (20 kHz)

  • The range humans can hear.

  • Low = bass drum, thunder (~50 Hz).

  • Mid = talking, music (~500–2000 Hz).

  • High = birds chirping (~8000 Hz).

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• Ultrasound: above 20,000 Hz

  • Too high for humans.

  • Used by bats, dolphins, and in medical imaging (ultrasound scans).

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2. By Loudness (Intensity, measured in decibels dB)

• Soft sounds: whisper (~30 dB)

• Normal conversation: ~60 dB

• Traffic noise: ~80 dB

• Rock concert / Jet engine: 100–120 dB (can damage ears)

• Above 140 dB = painful, dangerous.

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3. By Pitch (perceived frequency)

• Low-pitched: deep, rumbling sounds (drums, thunder).

• Medium-pitched: normal voices, guitar.

• High-pitched: whistles, bird calls.

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✅ Summary Table

Category	Range	Examples
Infrasound	< 20 Hz	Earthquakes, elephants
Audible sound	20–20,000 Hz	Human speech, music
Ultrasound	> 20,000 Hz	Bats, dolphins, medical scans