CIE physics paper 2

[falafail]

oct 2005 Q4 (a) (ii)

how are we suppouse to find area under tha graph?
 

i found the area of one big square then estimated the number of squares under the graph and multiplied it by the area that i got lol

thanks for answering my questions By the way, i'll check them out when i'm done with the paper i'm doing

[Tumble Bug]

oh and Q5 part c (i)and(ii) of the same paper...
thanx...

[Tumble Bug]

i found the area of one big square then estimated the number of squares under the graph and multiplied it by the area that i got lol

thanks for answering my questions By the way, i'll check them out when i'm done with the paper i'm doing

Np...

[khi2ruh]

oh and Q5 part c (i)and(ii) of the same paper...
thanx...

U have to use the relationship I is proportional to A^2

I is proportional to (3*10^-4)^2

take x as the intensity of wave B so then x is proportional to (2*10^-4)^2

((2*10^-4)^2)I=((3*10^-4)^2)(x)

solve the equation

x= 4/9 I

[Tumble Bug]

thanx a bunch!!!

[Tyserius]

I hate questions where they ask you to explain what will happen when the scenario changes... Must make sure it is with reference to the equations, logic and physics principles. So annoying!

[falafail]

I hate questions where they ask you to explain what will happen when the scenario changes... Must make sure it is with reference to the equations, logic and physics principles. So annoying!

agh, yeah. i don't like written questions, i'd rather calculate thingssssssss

By the way, can you check out the questions i posted on the first page? tumble bug did a few but she/he didn't know about some of them D:

[Tumble Bug]

agh, yeah. i don't like written questions, i'd rather calculate thingssssssss

By the way, can you check out the questions i posted on the first page? tumble bug did a few but she/he didn't know about some of them D:

lol...im a SHE...hheheh...

[MaNi_DaDuDe]

plz can u help me with this question?

A point source of sound radiates energy uniformly in all directions. At a distance of 3.0 m from source, the amplitude of vibration of air molecules is 1.0 X 10^-7 m. Assuming that no sound energy is absorbed, calculate the amplitude of vibration at a distance of 5 m from source.

Answer is 6.0 x 10^-8 m.

Cross multiply. :]

[Tyserius]

plz can u help me with this question?

A point source of sound radiates energy uniformly in all directions. At a distance of 3.0 m from source, the amplitude of vibration of air molecules is 1.0 X 10^-7 m. Assuming that no sound energy is absorbed, calculate the amplitude of vibration at a distance of 5 m from source.

Answer is 6.0 x 10^-8 m.

As I = ka² and is directly proportional to 1/r²,
ka² = m/r² (m is the other constant)
And since r is increased from 3.0m to 5.0m the new r, r' is = 5/3 r
So to find your new amplitude, a' :
ka'² = m/(5/3 r)²
ka'² = m/(25/9 r²)
ka'² = 9/25 m/r²
ka'² = 9/25 (ka²) << Substitute from ka² = m/r²
a' = 3/5 a
   = 3/5 (1.0 x 10^-7)
   = 6.0 x 10^-8m

[falafail]

QUESTIONSQUESTIONSQUESTIONS
get your past papers out, haha

june 05 question 6 (b) (ii)
nov 04 question 6 (b) (i)
nov 03 question 4 (a) how are you supposed to find the frequency from the graph(s)?  and, same question, part (b) (iii) wtf
nov 03 question 5 (a) (i) how do you know which one's the positive plate and which one's the negative? also, same question part (b) (ii)

phew.

tell me how to solve theeeeeeeese D:
also, june 03 question 4 (i) 1, and (iii)
what affects the seperation/brightness of fringes and stuff? i never actually got that .__.
Nov 02 5b (iii),
june 02 4b(ii),
nov 01 6- all of it.

plzplzplzplzpzlpzlpz tell me how to do these? anyone?

[saadiyah]

As I = ka² and is directly proportional to 1/r²,
ka² = m/r² (m is the other constant)
And since r is increased from 3.0m to 5.0m the new r, r' is = 5/3 r
So to find your new amplitude, a' :
ka'² = m/(5/3 r)²
ka'² = m/(25/9 r²)
ka'² = 9/25 m/r²
ka'² = 9/25 (ka²) << Substitute from ka² = m/r²
a' = 3/5 a
   = 3/5 (1.0 x 10^-7)
   = 6.0 x 10^-8m

thx a lot!^^

[happy angel]

tell me how to solve theeeeeeeese D:
also, june 03 question 4 (i) 1, and (iii)
what affects the seperation/brightness of fringes and stuff? i never actually got that .__.
Nov 02 5b (iii),
june 02 4b(ii),
nov 01 6- all of it.

plzplzplzplzpzlpzlpz tell me how to do these? anyone?

j03: a(i) the sources must have same frequency and wavelength and phase difference btwn the sources mustbe constant or zero..
and 4 (iii) u nid wich part? 1 2 or 3?

[saadiyah]

plzz help me with this one..

It is possible to use two separate oscillators feeding 2 loudspeakers to demonstrate interference of sound. It is not possible to use 2 filament lamps, however similar, to produce interference of light. explain this difference.

[falafail]

j03: a(i) the sources must have same frequency and wavelength and phase difference btwn the sources mustbe constant or zero..
and 4 (iii) u nid wich part? 1 2 or 3?

oh sorry, i meant 4 (b) (i) 1 not 4 (a) D:
and um, all of it. i need someone to explain what affects separation/brightness of fringes etc