# If intensity is increased by factors of 20 .Then by how many decibels the sound level will increase ?

Let I and I' be the old and new intensity of sound. Then, according to question
$I\text{'}=20I\phantom{\rule{0ex}{0ex}}⇒\frac{I\text{'}}{I}=20$

We know that

Then change in sound level can be given as

• 20
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