Name three devices which work on the reflection of sound

1. Stethoscope.
2. Loudspeaker.
3. Cinea Hall.

 There are many devises which work on the reflection of sound 

1. Stethoscope- A stethoscope is a medical device for listening to sounds inside the body. On one end of the stethoscope is a diaphragm, a vibrating membrane designed to pick up sound
2. Loud speaker- The speaker contains a magnet a coil and a permanent magnet, the sound is reflected byits components making the electromagnetic signals to audible sound.
3. Cinema hall- ceilings of a concert halls, conference halls and cinema halls are made curved so that sound after reflection reaches all the corners of the halls.
4. It is also used in finding if there is any fault in metal blocks.
5. It is used by animals such as bats to find their prey.
6. It is used in finding the depth of the sea.
   
    

1. Loud speaker- The speaker contains a magnet a coil and a permanent magnet, the sound is reflected byits components making the electromagnetic signals to audible sound.
2. Cinema hall- ceilings of a concert halls, conference halls and cinema halls are made curved so that sound after reflection reaches all the corners of the halls.
3. It is also used in finding if there is any fault in metal blocks.
4. It is used by animals such as bats to find their prey.
5. It is used in finding the depth of the sea.