# Math

posted by .

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 sound produced by a jet engine at a distance of 50 metres if the intensity is 10 watts per square metre.

b) Find the intensity of sound if the sound level of a pneumatic drill 10 metres away is 90 decibels.

c) Find how the value of d changes if the intensity is doubled. Give your answer to the nearest decibel.

d) Find how the value of d changes if the intensity is 10 times as great.

e) By what factor does the intensity of sound have to be multiplied in order to add 20 decibels to the sound level?

## Respond to this Question

 First Name School Subject Your Answer

## 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. ### Grade 12 Advanced Functions Math

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

2.58*10^(-5)watts/cm2 find the number of decibels for the power of the sound given. Round to the nearest decibel.
6. ### Maths

Find the number of decibels of sound produced by a jet engine at a distance of 50 metres if the intensity is 10 watts per square metre. This time I'll post the given formula too. Sorry to leave it out before! The dB scale for measuring …
7. ### Grade 12 Math Please help!!

Please can anyone answer this which I have posted previously?
8. ### math

Find the number of decibels for the power of the sound given. Round to the nearest decibel. A rocket engine, 2.37 x 10−5 (10 to the -5 power) watts/cm2(squared)
9. ### LOGS

The decibel level of a sound is given by dB=10log(EE0), where E0=10−12wattsm2 and E is the intensity of the sound. (a) Find the intensity of a 80-decibel sound. E= watts per square meter. (b) How many times more intense is the …
10. ### @Ms.Sue please help!!:(Math

Sound intensity is inversely proportional to the square of the distance from the sound source; that is I= k/ (r)^(2), where I is the intensity, r is the distance from the sound source, and k is a constant. Suppose that you are sitting …

More Similar Questions