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Phosu:

--- Quote from: ruby92 on March 27, 2010, 05:03:29 pm --- :-[ sorry
ok soo why is Ic =Ia+Ib
???are a and b going out of the junction?

--- End quote ---
if you complete the loop of both Ia and Ib you will find that they both meet up before entering the 3ohm resistor.
so Ia+Ib=Ic

i guess the going out part was just to create confusion

halosh92:

--- Quote from: ruby92 on March 27, 2010, 05:12:27 pm ---Two loudspeakers both emit sounds with a frequency of 340Hz. Both sounds have equal amplitude and phase. The amplitude is A. The speakers are 4m apart and face each other. (The speed of sound in air is 340ms-1)

a) What is the wavelength of the sound?

 0.5m
 1m
 1.5m
 2m
b) Ignoring the reduction of amplitude with distance from each speaker, what is the amplitude of the sound;

i) halfway between the speakers?

 0
 1 A
 2 A
 3.142 A
ii) 0.5m from either speaker?

 0
 1 A
 2 A
 3.142 A
iii) 1m from either speaker?

 0
 1 A
 2 A
 3.142 A

--- End quote ---

which paper is this?

ruby92:
this is from this website
http://www.acoustics.salford.ac.uk/feschools/waves/super.htm

halosh92:

--- Quote from: ruby92 on March 27, 2010, 05:48:23 pm ---this is from this website
http://www.acoustics.salford.ac.uk/feschools/waves/super.htm


--- End quote ---
the first part its 1m
 all the other parts have the same amplitude
but which amplitude i have no idea

ruby92:
its 2A then 0A then 2 A

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