Question

At a concert By the Who in 1976, the sound level 50 meters from the stag registered 120 decibles. The treshold of pain for the human ear is 90 decibles.

Calculate the sound intensity of the Who concert and the sound intenisity of the treshold of pain

Answer 1

I think you need to combine the sound intensity level formula and the inverse square law for this guy.

Answer 2

WILL YOU HELP ME DO THAT

Answer 3

why inverse square law?

Answer 4

CAN YOU HELP ME

Answer 5

PLEASE

Answer 6

here http://www.engineeringtoolbox.com/sound-intensity-d_712.html

Answer 7

YEAH THANKS BUT i DONT KNOW HOW TO START IT

Answer 8

WILL YOU HELP ME STAT=RT THIS PROBLEM PLEASE IM SO STRESSED

Answer 9

please read it carefully

Answer 10

I DID

Answer 11

PLEASE i WILL BE GRATEFULL TO YOU

Answer 12

WILL YOU GO STEP BY STEP WITH ME TO OLVE THIS

Answer 13

I will try to help, but I am not too sure. But please, take caps lock off.

Answer 14

ok

Answer 15

\[Intensity = \frac{Power}{4*\pi*r^2}\]

Answer 16

sorry, not 'power' but 'sound wave pressure'

Answer 17

ok

Answer 18

to find P, use this:
\[P = P_r * 10^\frac{SPL}{20}\]

P_r is the reference point

Answer 19

SPL = decibel level

Answer 20

ok

Answer 21

will you help further

Answer 22

so i understand

Answer 23

fr next time

Answer 24

What don't you understand?

Answer 25

calculaed the intensity of the concert and the pain

Answer 26

can you help

Answer 27

yes you can use those two formulas. First calculate the pressure, then you can use that to calculate the intensity.

Answer 28

yes can u supervise me

Answer 29

help

Answer 30

so I plug in 120 for SLP

Answer 31

Yes

Answer 32

according to wikipedia, P_ref is often regarded as 20 µPa in air, so I would use that for P_r

Answer 33

SO IT IS P=20*10(120/20)

Answer 34

IS IT RIGHT

Answer 35

yes that'll give you the pressure. then you need to find the intensity from a distance.

Answer 36

glad the caps are back.

Answer 37

so i did 20*10 which is 1200

Answer 38

then i did 120/20 which is 6

Answer 39

no, there is an exponent there:
\[20*10^\frac{120}{20}\]

Answer 40

= 20 000 000

Answer 41

i did that and i DID iT WRONG

Answer 42

like i have this website from school and it checks my work and I did it wrong

Answer 43

can u guide me

Answer 44

again

Answer 45

srry to bother you

Answer 46

heisenberg you there

Answer 47

what did you get?
I get = 636.619772

Answer 48

i got that also

Answer 49

it not right

Answer 50

tAT IS NOT RIGHT HEISENBERG

Answer 51

please help again

Answer 52

nm