Question

Let i0=1.0*10^-12 watt per square meter be the energy intensity of the softest sound detectable by the human ear. Let L(i)=10*log(i/i0) be the formula for the loudness of a sound, in decibels(dB), whose energy intensity is i. Find the decibel measure of the sound whose energy intensity is 8*10^-4 watt per square meter.

A.80.0 dB
B.89.0 dB
C.98.0 dB
D.107.0 dB
E.116.0 dB

Answer 1

B

Answer 2

Can I ask how you found that?

Answer 3

L= 10log (i/i0)
i = 8 * 10^-4
i/i0 = 8*10^8

Answer 4

right

Answer 5

log (8*10^8) = log 8 + log 10^8
= 0.903 + 8

Answer 6

that into ten is 89

Answer 7

got it?

Answer 8

yes thank you!

Answer 9

ne more?

Answer 10

Find the logarithm without using a calculator: log (radical)
100000000000 =

Answer 11

wts radical?

Answer 12

if its log to the base 10 then count the no of zeros and thats d answer