Question

sometime reflection of sound may be undesirable. can you give any example?

Answer 1

due to some natural process.
such as , if a speaker is playing and wind blows up through it , it blows up its vibtation in different direction.

Answer 2

Noise is a reflection of sound that can be quite unpleasant for the ears.

They can be disruptive and loud to hearing and are produced by vibrations from a medium, like water or air.

There can be many types of noises that may be audible or may not be audible to us.

Acoustic noise from a music, speech or instrument can be heard easily, whereas we may not be able to hear electronic noise.

For detecting electronic noise, we may need advanced instruments for detection.