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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Hitler's rise to power was an extreme use of propaganda, as the Germans were stuck in the middle of the great depression, and the German government, the Reichswher, a democratic government that was formed at the end of ww1, was paying the allies several million marks to pay of the reparation fines at the treaty of Versailles, but the government printed so much marks, the value of the mark plunged down until a cup of coffee cost hundreds of marks. Hitler used this a propaganda to stir the German people to follow him. Another factor was the elected chancellor on January 30, 1933. Two months after this, The president, Hindenburg, died, and Hitler became chancellor and president, and had all the power of the German government.
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