If the intensity of sound is doubled, by how many decibels does the sound level increase ?

Answer

B, C, D

Explanation

We know that `beta=10 log_10 I/I_0`
According to the questions
`beta_A=10 log_10 I/I_0`
and `beta_B=10log_10((2I)/I_0)`
`rarr beta_B-beta_A=10 log((2I)/I)`
` =10xx0.3010=3dB`