Question

an easy definition of reverberation why excess of reverberation is undesirable

Answer 1

Reverberation is the phenomenon of persistence of sound after it has been stopped as a result of multiple reflections from surfaces such as furniture, people, air etc. within a closed surface. These reflections build up with each reflection and decay gradually as they are absorbed by the surfaces of objects in the space enclosed.
It is same as the echo, but the distance between source of sound and also the obstacle through which it gets reflected is more less in case of this reverberation.

Disadvantages :
If a room has about nearly no any sound absorbing surfaces like wall, roof and the floor, the sound is said to bounce back between the surfaces and also it takes a very long time as the sound dies. In such a room, the listener will then have a problem for registering the speaker. This is because he tends to hears both the direct sound as well as the repeated reflected sound waves. And also if these reverberations will be more excessive, the sound is said to run together with a mere loss of articulation, and it becomes muddy and also garbled.

Hope it helped

Answer 2

listen dearie, :p
the repeated reflection that result in the persistence of sound is called reverberation.......
now
.
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