they interpolate each other... and we call them "beat"

e.g. a very very similar frequency say 110hz and 111hz

another parameter also come into play... magnitude

it is the timing of the frequency that determine the magnitude

say,

frequency A at 60Hz so, it osccillate oen time every 1/60second... with maximum magnitude of 10dBa

frequency B at 61hz which osccilate at 1/61second per one cycle with magnitude of 10dBa as well....

so, B is faster than A...

when the time is 10 second, A has reach 1/6 time of its magnitude say.. 1.6666666666.....

same for B at 10 second with magnitude of 1.6393443dBa

the two wave travelling at different speed and SO, there will be time where one is at +ve and the other is -ve


as for this 10 second case, both is at positive, so the total magnitude is A + B at 10 second interval....

it is the totally identical Hz with the natural Hz that we known as resonance

This post has been edited by Awakened_Angel: Sep 14 2010, 02:10 PM

refer to the links



from the simple eg that ai worked out, it is seen that resultant is that the magnitude reach 0 when t=5sec which mean, t(resultant) take 10sec for one full cycle

so, you have it.. 10sec for one cycle

so, the frequency is 1/10 Hz

(I just agak agak put the numbers only, might not be accurate & not making any sense at all )

it is the same...

to get the total resultant, you need to work out the two frequency so they interpolate with each other

take this laymen example:

A person.. small girl
B person... adult male

both of them scream at the same time standing side by side at totally different magnitude(loudness) and frequency

there aretiems where the adult`s voice would be louder or lesser than nromal.. due to the girl`s voice amplify or neutralise the magnitude due to interpolating of both wave



This post has been edited by Awakened_Angel: Sep 14 2010, 03:03 PM

where you come out with this?



you can calculate the F from the graph after you interpolate the resultant

wrong concept... direct summation does not yield the accurate result



what is sound? Sound is define as molecular`s vibration that is detectable by human ear.... the dBa is the intensity on how strong the thing vibrate/osccilate

not quite... take this simple example...

take a ruler... hold it with your hand and left the other half in open air.. now, use your other hand to hit the free end. It will swing right? up, center, down again and again.. until the energy that you apply are used to fight the plasticity of the ruler & against air resistance/drag

now, when that ruler swing, it distort the air around you(same goes to speaker) and alas, our mortal ear could not pickup this wave at all frequency at all magnitude....

as for the ruler, it swing up and down, when it is up, we consider it as +ve and down as -ve while center as 0

P/S here`s another simple test

apparatus: 2 human, 1 rope
method: each human hold the rope at each end, both would swing the rope at different speed & power(magnitude)

result.. see for yourself

This post has been edited by Awakened_Angel: Sep 15 2010, 02:09 PM

close.....

it is an idealised motion. Such constant, uninterupted graph is hard to obtain in the real world

read me.. you will NEVER get it. IF you can get it, it wont be known as IDEALised

what you can do is to get closer and closer to it

P/S it is like you ask me. what is my Ideal Wife? sure is pretty, perfect body shape, fine complexion, knows how to cook, knows how to dress nicely, considerate, manja manja with you, good on bed , what else?

and you ask me, how to find this woman? I also want to know...



This post has been edited by Awakened_Angel: Sep 20 2010, 03:29 PM

You are giving heavy stuff la.. hard to digest

P/S I have all returned my mathematics to my lecturers.... after 5 years into business, I only left with the theory & formulae.... compared to tedious & complicated mathematical solving skills....

if this is true, and you comprehend what I meant, then you are a talented science minded person indeed

you are right.... it is just different unit for same measurement... feet vs meter vs yard ; pound vs kg ; gallon vs litres

radian is a unit used specifically for some application in engineerings..... as it is easier to use radian than degree in some part

English** dude.. english**.... luckily I dwelled in the never land of engineerica... and manage to speak a phrase or two in ENGLISH*

** England`s mother tongue....

*ENGINEERING`s mother tongue... math