The time that it takes a sound to decrease to 1/1000th of its original level is the reverberation time.
Reverberation time (RT) is that the time needed for the sound in a very area to decay over a selected dynamic vary, typically taken to be sixty decibel, once a supply is suddenly interrupted.
The reverberation time depends chiefly on a room's volume and space and on the absorption at the walls. usually absorption is frequency dependent and so the reverberation time of a space varies with frequency. Some materials that could be used to scale back reverberation are fibre board, serious curtains, plastics etc.
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Bib·li·og·ra·phy
a list of the books referred to in a scholarly work, usually printed as an appendix.
<span>a list of the books of a specific author or publisher, or on a specific subject."a bibliography of his publications"
the history or systematic description of books, their authorship, printing, publication, editions, etc.</span>
Intelligence tests
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The answer is typically A. But really, any of these can be chosen, as many modern couples seem to want to delay everything until they've settled into their careers. But children is definitely the biggest one.
