Doomlearn
DE
Body & HealthFact

Hair cells in the ear don't grow back. Ever.

Around 16,000 hair cells per ear turn sound into nerve signals. Once noise destroys them, the loss is permanent. The accepted limit is 85 dB over eight hours – street traffic. Every extra 3 dB halves the safe time: at 100 dB (a concert) it's only 15 minutes. The WHO estimates 1 billion young people are at risk.

Useful: Earplugs at a concert cost a euro – a hearing aid costs thousands.

Source: who.int

HoerenLaermschutz

Difficulty:

Question on this card

What happens to safe listening time when the level rises by 3 dB?

  1. It stays the same
  2. It halves
  3. It drops by 3 %
  4. It doubles
Show the answer

Correct: It halves

3 dB more means double the sound energy – half the safe time.

Related cards

Keep reading

This card belongs to the topic Body & Health. Every card is short, cites a source and can be saved – due ones come back by themselves later.

About Doomlearn · Projects · Legal notice · Privacy · Terms