where 𝛽 = 91.0 dB and I0 = 1.00 ✕ 10−12 W/m2 is the reference intensity equal to the threshold of hearing at a frequency

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where 𝛽 = 91.0 dB andI0 = 1.00 ✕ 10−12 W/m2 isthe reference intensity equal to the threshold of hearing at afrequency of 1 kHz.
In part (a), the unknown quantity to be determined is the soundintensity I at a distance of 1.45 m from the fire alarm. Which ofthe following is the correct value for the fire alarm's intensityat a distance of 1.45 m from the alarm?
a. 9.10 ✕ 10−12 W/m2
b. 1.26 ✕ 10−3 W/m2
c. 1.26 ✕ 103 W/m2
d. 9.10 ✕ 1012 W/m2
e. none of the above