Sound and hearing

How loud is too loud for headphones?

The damage is not sudden. It is quiet, permanent, and entirely avoidable.

Article9 minSciencePE

How loud is too loud for headphones? — illustration

Sound is a wave in matter

Vibrating air pushes and pulls at the eardrum. Bigger amplitude means more energy arriving each second — what we hear as loudness.

Hair cells do not grow back

Inside the cochlea, tiny hair cells convert vibration into nerve signals. Sustained high-energy sound flattens them, and human hair cells never regenerate.

The 60:60 rule

Around 60% volume for no more than 60 minutes at a time is the common guideline. Noise-isolating earphones help because you stop turning the volume up to beat background noise.

Check your understanding

1. Loudness relates to which property of a sound wave?

2. Why is hearing damage permanent?

3. What does the 60:60 guideline suggest?

Your turn

Log your listening volume for three days and see whether the 60:60 rule fits your habits.

Luna: Only if you feel up to it — one more?

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Curriculum objectives covered

Understand the similarities and differences between light waves and waves in matter
Interpret observations and data, including identifying patterns