Quick Notes

Phenomenon of Reflection of Sound Waves

• An echo is produced when sound waves are reflected from a hard surface. The echo sounds the same as the original sound but takes some time to reach the listener's ears
• An echo can be heard in empty rooms, caves and tunnels

Application of Reflection of Sound Waves

• The reflection of different sound waves can be produced when sound waves hit different surfaces
• Example : Ultrasound - can be heard by animals such as bats which use it for navigation

Limitations of Hearing

• The limited sense of hearing in humans make us unable to hear soft sounds and sounds from a distance

1. Stethoscope
2. Megaphone
3. Hearing aids