[单选题]
A person standing 5.0 m from a barking dog measures the sound intensity level to be 65 dB. Whatwould be the intensity level at that same distance if two identical dogs very close to each other arebarking?
A. 34 dB
B. 65 dB
C. 68 dB
D. 130 dB
E. 136 dB
参考答案: C
本题详细解析: $dB=10log\frac{I}{I_o}$;65dB for I. so $2I=68dB$
