Which one of the following is the correct sound intensity expression w

1.	Which one of the following is the correct sound intensity expression with usual notations ?
A.	dB = 10 log10 (I/I0)2
B.	dB = 10 log10 (I/I0)
C.	dB = 10 log10 (I - I0)2
D.	dB = 10 log10 (I - I0)
Answer» C. dB = 10 log10 (I - I0)2

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Which one of the following is the correct sound intensity expression with usual notations ?

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