Q.

In expressing sound intensity, we take 10-19 Wm-2, as the reference level. For ordinary conversation, the intensity level is about 10-6 Wm-2. Expressed in decibel, this is

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a

106

b

6

c

60

d

loge (106)

answer is C.

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Detailed Solution

Bel is log10⁡II0. Here it is 6. In decibel, it is 60. SOUND LEVEL =S.L=  log10110-6=6log1010=6 bel=60 dB
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In expressing sound intensity, we take 10-19 Wm-2, as the reference level. For ordinary conversation, the intensity level is about 10-6 Wm-2. Expressed in decibel, this is