Physics: Post your doubts here!

[xxxtoughxxx]

hey um a little confused wiv effects of differnt changes to da doubles slit exp...if da light intensity increase the ms stated b4 dat brightness of bright fringes increases nd dark ones r darker? but shouldnt da dark ones stay da same bec even if da amplitude increases its still destructive interference nd is cancelled anyways? i mean if u increase da width of slits wiv a constant it remains da same y change here? plz some1 help wiv dis lame part .......alsoo i would appreciate it if some1 drew da graph in q(5)a- if da printin wuz right ofcourse nd stress is reduced from 2.5x10^8... tyy nd plzz answerrrr!!

 

[RGBM211]

http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w09_qp_21.pdf
http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w09_ms_21.pdf

question no.7a),b)

need help in drawing ne1

 

[Sanis]

concerning MeV for radioactivity help plz

 

[vaibhavnatarajan]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w09_qp_21.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w09_ms_21.pdf

question no.7a),b)

need help in drawing ne1

its something like this...

 

[Muhammad Ahmer Ali]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w09_qp_21.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w09_ms_21.pdf

question no.7a),b)

need help in drawing ne1

In part a, draw a continue the dotted horizontal line from the original alpha path before it is deviated.Then draw an angle b/w the horizontal and the deviated curve. As for part (b) this alpha particle B is also deviated away from the nucleus but the extent and angle of deviation is less than A because it is further away........

 

[raamish]

how does a potentiometer work. And why does the current becomes o on the ammeter?

 

[vaibhavnatarajan]

In part a, draw a continue the dotted horizontal line from the original alpha path before it is deviated.Then draw an angle b/w the horizontal and the deviated curve. As for part (b) this alpha particle B is also deviated away from the nucleus but the extent and angle of deviation is less than A because it is further away........

isnt it something like this...

 

[SalmanslK]

can anyone please post the solutions of these two questions.regarding progressive and stationary waves...do post the answer to the graph as well. Please

 

[SalmanslK]

im having difficulty in finding phase difference and plotting graphs. For Progressive I found phase difference to be= 360*(40/80) and it's graph after 0.5 T is attached below. am i right? and what about the stationary wave?

 

[Yousuf Ykr]

can anyone please post the solutions of these two questions.regarding progressive and stationary waves...do post the answer to the graph as well. Please View attachment 11254View attachment 11255

i)Amplitude is 7.6mm which you can see it from the graph (the highest displacement)
ii) 180 (This is 180 because, one graph is completed in 80cm.....So in 80cm 360 degree is completed. So there is a phase difference of 40cm between the point. So it is half of 80com and hence it is half of 360, which is 180.......Or you could use this formula- (40/80)*360 which is the normal formula of phase difference)
iii) V=frequency * wavelength
= 15 * 0.8
=12
(b) This one i have to show you by drawing....if you are interested then i can show you
(c)
i. Zero (Since they are on the same wave and phase)
(ii)
Antinode- A region in which two amplitude are at its highest point in opposite direction
Node- A region where two waves intersect and have no displacement

(iv) Again, i have to draw this...if you are interested then i could give a separate PDF for this by drawing in computer

 

[Yousuf Ykr]

Can anyone help me with these
m/j 2007- 5b (ii)
m/j 2011 21- 2c(i) 5 (ii)b
m/j 2011 22 5b(ii) 6(ii)1

 

[SalmanslK]

yes please attach the graphs for both parts.

 

[hmlahori]

http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w10_qp_21.pdf
http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w10_ms_21.pdf
Q 2(b) and Q 6(a ii) Can someone show exactly how these both are drawn? i have read the mark scheme and examiner report but i might be thinking it is drawn some other way entirely so just to verify my own drawings.

http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w09_qp_21.pdf
http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w09_ms_21.pdf
Q 7(b) in this i also want to confirm if my drawing is correct so if someone else can show the correct one..

 

[USMAN Sheikh]

i)Amplitude is 7.6mm which you can see it from the graph (the highest displacement)
ii) 180 (This is 180 because, one graph is completed in 80cm.....So in 80cm 360 degree is completed. So there is a phase difference of 40cm between the point. So it is half of 80com and hence it is half of 360, which is 180.......Or you could use this formula- (40/80)*360 which is the normal formula of phase difference)
iii) V=frequency * wavelength
= 15 * 0.8
=12
(b) This one i have to show you by drawing....if you are interested then i can show you
(c)
i. Zero (Since they are on the same wave and phase)
(ii)
Antinode- A region in which two amplitude are at its highest point in opposite direction
Node- A region where two waves intersect and have no displacement

(iv) Again, i have to draw this...if you are interested then i could give a separate PDF for this by drawing in computer

ya i wont da graphs too pls make them !!!

 

[Silent Hunter]

i)Amplitude is 7.6mm which you can see it from the graph (the highest displacement)
ii) 180 (This is 180 because, one graph is completed in 80cm.....So in 80cm 360 degree is completed. So there is a phase difference of 40cm between the point. So it is half of 80com and hence it is half of 360, which is 180.......Or you could use this formula- (40/80)*360 which is the normal formula of phase difference)
iii) V=frequency * wavelength
= 15 * 0.8
=12
(b) This one i have to show you by drawing....if you are interested then i can show you
(c)
i. Zero (Since they are on the same wave and phase)
(ii)
Antinode- A region in which two amplitude are at its highest point in opposite direction
Node- A region where two waves intersect and have no displacement

(iv) Again, i have to draw this...if you are interested then i could give a separate PDF for this by drawing in computer

Yep. i also want the graphs

thanks alot

 

[Wanzi21]

hello!
does anyone have full sheet of formulae for Physics(AS) in here??

 

[BilalAthar]

Could anyone explain june 10/23 Q.2c and Q.3 http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_s10_qp_23.pdf

 

[hmlahori]

please someone answer the question i have posted above on this page its the second time i posted them !!

 

[Saad Sarfraz]

Okay so please help me on this sum 09 paper 21 Q5B

 

[iKhaled]

need help in May/June 2011 paper 21

question 3 c) iii
question 6 b)..

http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_s11_qp_21.pdf