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Your Question
Express the folllowing in Db s.
1.The increse in intensity level due to the power from a loudspeaker changing from 5W to 20W.
2.The decrese in the intensity level due to moving from 5m to 15m away from a source,which is emmitting sound energy uniformly in all directions.
3.The difference in intensity level between a noice of 10 to the power-3 Wm-3 from a \"Tube train\" and a noice of 5*10to the power Wm-2 due to shouting at a distance of about 4m.
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