Sound intensity assignment
Due: Sunday 29/3/2020
Q1) Calculate the intensity of the sound waves from an electric guitar’s amplifier at a distance of 5 m when its power output is equal to each of the following values:
a. 0.25 W
b. 2 W
Q2) When the decibel level of traffic in the street goes from 40 to 60 dB, how much greater is the intensity of noise?

Q3) An intensity of 1.0 X 10-1 w/m2 can cause damage to the ears. If the power of sound from a rock band’s amplifier is 85 w, how far are you standing from the speaker if you are damaging your ears?

Q4) Point A and B located at 4 meters and 9 meters from a source of the sound. If IA and IB are intensity at point A and point B, then find IA : IB

Q5) The intensity of a source of sound is 10−9 Wm−2. Io = 10−12 Wm−2. What is the sound level of 10 sources of sounds?

Q6) The sound level of a source of sound is 10 dB. What is the intensity of 1000 sources of sound?

Q7) If point P is the source of sound, then what is the ratio of sound intensity at points S, R, and Q ?

Q8) The sound intensity of a source of sound is 6 x 10-6 W/cm2. If the sound intensity level increased by 10 db, determine the intensity of sound.
Q9) An 4-hour exposure to a sound intensity level of 110.0 dB may cause hearing damage. What energy in joules falls on a 0.800-cm-diameter eardrum so exposed?
Q10)A microphone in the ocean is sensitive to sounds emitted by porpoises. To produce a
usable signal, sound waves striking the microphone must have an intensity of 10 dB. If porpoises emit sound waves with a power 0.05 W, how far can a porpoise be from the microphone and still be heard?

i need the answer to this too but idk it ; -;

elly's long hair:

a. if the salon only takes cash, then this isn't the problem. it doesn't matter how much she has in her checking account.   she can't get a haircut until she has the cash.

b. if she has overdraft protection, then there's no problem.   she can go ahead and write a check that her account can't cover, then sometime later, pay the bank some outrageous usury for loaning her a few bucks for a few days, but with beautiful hair.

c. if elly has some principles, and doesn't want to write a bad check, then now she has a problem.   her desire for the new hairstyle is in conflict with her honesty and integrity.

d.   if the bank will not process a check she writes, then even if she had a million $$ in her account, she couldn't use any of it.   the amount she has in her account is not the problem.   and if i may suggest, she might as well close her checking account, and put the money where it'll work for her.   it's not doing her a bit of good in a checking account, since she can't write any checks.

justin can't pay the full balance:

a. he can't even handle the credit limit he has now.   under no circumstances should he ask for a higher limit.

b.   he can ask for the grace period to be extended.   but that's no solution, the bank will almost certainly refuse anyway, and there are much better options.   he knew the rules of his credit card when he started using it.

c.   he definitely should pay the interest on the balance, plus as much of the balance as he can cover at the same time.

d.   he definitely should pay the minimum otherwise they could shut down his card.   he should also pay as much more as he possibly can.   he should also remember the awkward situation he's in, stop buying stuff on credit that he can't afford, and avoid adding any more debt.

i'd say that justin's best best option isn't on this list of choices.   what he has to do:   pay as much as he can at least the minimum payment plus as much more as he can and then avoid adding more debt.