Posted by **Donna** on Sunday, February 16, 2014 at 5:25pm.

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?

## Answer This Question

## Related Questions

- Grade 12 Math Please help!! - Please can anyone answer this which I have posted ...
- Maths - Find the number of decibels of sound produced by a jet engine at a ...
- Math - On th decibel scale, the loudness of a sound, in decibels, is given by D=...
- Grade 12 Advanced Functions Math - Hello! Can someone please help me out for ...
- 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 ...
- math derivative please help - the derivative of 2x^e is zero right or no? do i ...
- ALGEBRA - I have two problems that I am not sure about how to work out. 1. The ...
- Algebra - I have two problems that I am not sure about how to work out. 1. The ...
- Algebra - How can you find log base 3 of 242/5 using the given information ...

More Related Questions