Monday

December 22, 2014

December 22, 2014

Posted by **Joan** on Tuesday, January 19, 2010 at 12:06am.

The loudness, L, of a sound in decibels can be calculated using the formula L= 10 log(I/ F) where I is the intensity of the sound in watts per square metre and F= 10^ -12 . A singer is performing to a crowd. Determine the intensity of the singers voice if the sound level is 90 dB.

This is what i have so far:

90 = 10 log [ I/F]

10^1.9543 = 10 log [I/F]

What should i do now?

* F is really a (I) with a zero underneath..but i didnt know how to type that in

- Grade 12 Advanced Functions Math -
**Marth**, Tuesday, January 19, 2010 at 9:50am90 = 10 log [ I/F]

Use the properties of logarithms to isolate I.

9 = log(I/F)

10^9 = I/F

**Answer this Question**

**Related Questions**

Math - On th decibel scale, the loudness of a sound, in decibels, is given by D=...

Algebra 2 - Can someone help me? I'm really confused. The loudness L of a sound ...

Algebra II - 1. A sound has an intensity of 5.92 „e 1025W/m2.What is the ...

8th grade science - The loudness of sound can be measured in decibels. Do you ...

Grade 12 Math Please help!! - Please can anyone answer this which I have posted ...

algebra 2 - the loudness L of a sound in decibels is given L=10log10R, where R ...

Math - Formula given: The decibel (dB) scale for measuring loudness, d, is given...

Maths - Find the number of decibels of sound produced by a jet engine at a ...

Math - At a concert, the loudness of sound, L, in decibels, is given by the ...

Math - At a concert, the loudness of sound, L, in decibels, is given by the ...