posted by .

Hello! Can someone please help me out for this question?

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 didn't know how to type that in

• Grade 12 Advanced Functions Math -

90 = 10 log [ I/F]

Use the properties of logarithms to isolate I.

9 = log(I/F)
10^9 = I/F

Similar Questions

1. Math

At a concert, the loudness of sound, L, in decibels, is given by the equation L=10log(I/I_o), where I is the intensity, in watts per square metre, and I_o, is the minimum intensity of sound audible to the average person, or 1.0 x 10^-12 …
2. Math

At a concert, the loudness of sound, L, in decibels, is given by the equation L=10log(I/I_o), where I is the intensity, in watts per square metre, and I_o, is the minimum intensity of sound audible to the average person, or 1.0 x 10^-12 …
3. Algebra 2

Can someone help me? I'm really confused. The loudness L of a sound in decibels is given by L= 10log(base10)R, where R is the sound's relative intensity. If the intensity of a certain sound is tripled, by how many decibels does the
4. Math

On th decibel scale, the loudness of a sound, in decibels, is given by D=10log(I/I0), where I is the intensity of a sound barely audible to the human ear. If the intensity of a sound is 10^11I0, what is the loudness in decibels?
5. algebra 2

the loudness L of a sound in decibels is given L=10log10R, where R is the sound's relative intensity. if the intensity of a certain sound is tripled, by how many decibels does the sound increase?
6. Algebra II

1. A sound has an intensity of 5.92 „e 1025W/m2.What is the loudness of the sound in decibels?
7. Math

Formula given: The decibel (dB) scale for measuring loudness, d, is given by the formula d = 10 log base ten(I X 12 to the power of 12) where I is the intensity of sound in watts per square metre. a) Find the number of decibels of …