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  4. For a sound source of intensity I W / m 2, corresponding sound level is B0 decibel. If the intensity is increased to 4 I, new sound level becomes:

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Q. For a sound source of intensity $I W / m ^{2}$, corresponding sound level is $B_{0}$ decibel. If the intensity is increased to $4 I$, new sound level becomes:

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Solution:

If intensity is doubled the sound level is increased by $3.0 \,dB$. i.e., it becomes $\left(B_{0}+3\right)$ decibels. Hence when intensity is increased four times, level becomes $\left(B_{0}+6\right)$ decibels.