Question #2e09c

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Question #2e09c

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Answer 1 · 2017-04-18T11:21:55

#3.98xx10^-4Wm^-2#

Explanation:

Threshold of Hearing (TOH) is #0dB# and taken as #=1xx10^-12 Wm^-2#

Let #86.0dB=xWm^-2#

Implies that
#10 log(x/(1xx10^-12))=86.0#
#=> log(x/(1xx10^-12))=8.60#
Taking #"anti "log#
#=> x/(1xx10^-12)=3.98xx10^8#
#=> x=3.98xx10^8xx1xx10^-12#
#=> x=3.98xx10^-4Wm^-2#

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