Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.

Explanation

Mega phone, loudspeaker, hearing aid, etc., are the devices which work on the reflection of sound.
The main part of the mega phone or the loudspeaker is a horn shaped tube. This tube prevents the spreading of sound waves in all directions. The sound entering the tube undergoes multiple reflections and comes out of the tube with a high directionality and it can propagate through longer distances.