MP Board · Class 9 · Science · SoundWhat is the audible range of hearing for a healthy human ear? How does this range vary for young children and elderly people?

The normal audible range of hearing for a healthy human ear is approximately from $20\text{ Hz}$ to $20,000\text{ Hz}$ ($20\text{ kHz}$). Frequencies below $20\text{ Hz}$ are infrasonic, and frequencies above $20\text{ kHz}$ are ultrasonic. Young children (under five years of age) and some animals like dogs can hear higher frequencies up to $25\text{ kHz}$. However, as people grow older, their ears become less sensitive to higher frequencies, reducing their upper audible limit.