19: a man standing at the sound intensity level of 60 decibels. If he touches the ear, which absorbs sound intensity properties have 90 percent, he will hear the sound intensity level dropped by how much.
19: The man who stood at the level of intensity noise 60 decibels if they enter the ear, which possesses absorption intensity noise by 90 percent, he would hear the sound intensity decreased. by how much
19: a man standing at a position of sound intensity level 60 decibels. If he put that cover the ears which are treasure to absorb the sound intensity level 90 he heard the sound of the sound intensity decreased much.