integer type

if sound level at a place is increase by 30Db pressure bcums 4x times . find x

1 Answers

L=10log₁₀(II_o)
30= L₂ - L₁=10 log(I₂I₁)..............(1)
(I₂I₁) = 10³(change in p₂change in p₁)²=10³ {from (1)}

which gives
(change in p₂change in p₁) â‰ˆ32

So ans. is 8

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