Answer:
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Step-by-step explanation:
Find the area of the shape shown below.
2 answers:
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Answer:
138.23 feet
Step-by-step explanation:
The minutes and seconds hands of a clock rotates in a circular manner no matter the shape of the clock. Therefore the distance covered by the minute hand of the clock is calculated by the circumference of a circle:
C = 2πr
C = 2 * * 22
C = 138.23 feet
Given: Sound Intensity ( I ) =
We know, the approximate threshold of human hearing is at 1kHz. In watts/m^2 it's value is ⁻¹² W/m².
So, we can say, Reference sound intensity = 10⁻¹² W/m².
We have formula for "sound intensity level LI in dB" when entering sound intensity.
LI = 10×log (I / Io) in dB
Plugging values of I and Io in formula.
LI = 10 × log ()
LI = 10 × log (99000000)
= 10 × 7.99564
LI = 79.96 dB.
Therefore, 79.96 dB is the sound level for a noise that has an intensity of 9.9 × 10-5 watts/m2.