Physics: Post your doubts here!

[Taci12]

http://www.xtremepapers.com/community/attachments/diode-png.9242/

ow cool tx...pls just check...is this what you mean? i got it from one of the older threads.........ow g'luck for your p5!

exactly

 

[Soldier313]

exactly

cooool...thanx a million sis all the best for your paper

 

[Taci12]

Didn't even do anything :s Thanks! Hope all goes well

 

[Alice123]

pls help me wid Q26...... http://www.xtremepapers.com/community/members/taci12.40527/
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_13.pdf
thanks

 

[cowarrior]

HELP NEEDED GUYS....!!!! AS LEVEL PHYSICS

http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_s06_qp_1.pdf
CONFUSED IN QUESTIONS (37) PLEASE TELL ME IN DEATIL
(33) (31)(12) (24) (27) AND (28)

YOUR HELP WILL BE HUMBLY APPRECIATED..!!!!

 

[Daniyal23]

http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_s06_qp_1.pdf q24..Answer is B Its an easy question but cant seem to figure it out. I know that Intensity is directly proportional to A^2 * F^2 but how to use this equation to get the correct answer?

 

[Taci12]

pls help me wid Q26...... http://www.xtremepapers.com/community/members/taci12.40527/
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_13.pdf
thanks

This is the same as question 27, p11 of the same session. Inboxed you already

 

[Taci12]

HELP NEEDED GUYS....!!!! AS LEVEL PHYSICS

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s06_qp_1.pdf
CONFUSED IN QUESTIONS (37) PLEASE TELL ME IN DEATIL
(33) (31)(12) (24) (27) AND (28)

YOUR HELP WILL BE HUMBLY APPRECIATED..!!!!

Question 12:
momentum is conserved
momentum = p =mass x velocity

initial total momentum = (3m x v) + (m x -2v) = mv

as they stick together after collision, their velocity after collision is the same

total final momentum = (3m + m) x velocity = mv
4m x velocity = mv
velocity = v/4

Question 24:

if frequency is halved, the period is doubled as f=1/T
--> time taken for 1 complete cycle is doubled

intensity ∝ (amplitude^2)
amplitude ∝ √intensity

if intensity is doubled, thus the new amplitude is √2= 1.4

thus it's option B

 

[Taci12]

HELP NEEDED GUYS....!!!! AS LEVEL PHYSICS

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s06_qp_1.pdf
CONFUSED IN QUESTIONS (37) PLEASE TELL ME IN DEATIL
(33) (31)(12) (24) (27) AND (28)

YOUR HELP WILL BE HUMBLY APPRECIATED..!!!!

Question 27:
always, to calculate number of visible orders/images
d sin θ= nλ
d=1/N

sin θ/N= nλ

sin θ=nλN
for all orders except zero order

sin θ<1
nλN<1
n<1/(λN)

If we increase the number of lines per m, i.e N,
number of visible orders decreases

As for the angle:
sin θ=nλN
Increase N, sin θ increases.
As θ is acute, when sin θ increases, so does θ

so answer is B

Question 28:
fringe width= β = λD/d

λ= wavelength, D= distance between screen and double slit arrangement, d= separation of slits

If we halve d, β is doubled,i.e takes on a value of 8 mm

Then D is doubled, β is doubled again, β= 2 x 8 = 16 mm

Question 31:
Q=charge
Q=It
Q=ne
ne=It
rate of flow of electrons = n/t = I/e
= 4.8 / (1.6 x 10^-19)
= 3.0 x 10^19

Current flows from higher potential to lower potential, and electrons flow in the opposite direction.
Hence electrons flow from negative electrode of cell to positive electrode, i.e Y to X

 

[Taci12]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s06_qp_1.pdf
CONFUSED IN QUESTIONS (37) PLEASE TELL ME IN DEATIL
(33) (31)(12) (24) (27) AND (28)

YOUR HELP WILL BE HUMBLY APPRECIATED..!!!! [/quote]

Question 33:
-->use potential divider formula
p.d between X and P=V1= [500/(500+1000)] x 12 = -4.0 V
p.d between P and Y =V2 = [2000/(2000+1000)] x 12 = 8.0 V

total p.d between X and Y = 4.0V

 

[queen of the legend]

paper 1 doubts
please help

(All may/june)

03: 11, 13, 15, 17 , 22, 40

04: 6, 11, 14, 16, 33 ...(why 16 is not d?)

05 : 4, 7, 11, 13, 15, 24, 32, 33, 37.

07: 27, 33 , 40

08: 16, 24, 23, 26, 32, 34

 

[Alice123]

This is the same as question 27, p11 of the same session. Inboxed you already

ohhh!!! thanks

 

[cowarrior]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s06_qp_1.pdf
CONFUSED IN QUESTIONS (37) PLEASE TELL ME IN DEATIL
(33) (31)(12) (24) (27) AND (28)

YOUR HELP WILL BE HUMBLY APPRECIATED..!!!!

Question 33:
-->use potential divider formula
p.d between X and P=V1= [500/(500+1000)] x 12 = -4.0 V
p.d between P and Y =V2 = [2000/(2000+1000)] x 12 = 8.0 V

total p.d between X and Y = 4.0V[/quote]
A very thanx to you........

 

[cowarrior]

Question 12:
momentum is conserved
momentum = p =mass x velocity

initial total momentum = (3m x v) + (m x -2v) = mv

as they stick together after collision, their velocity after collision is the same

total final momentum = (3m + m) x velocity = mv
4m x velocity = mv
velocity = v/4

Question 24:

if frequency is halved, the period is doubled as f=1/T
--> time taken for 1 complete cycle is doubled

intensity ∝ (amplitude^2)
amplitude ∝ √intensity

if intensity is doubled, thus the new amplitude is √2= 1.4

thus it's option B

ok what about question (37)??

 

[aniroula]

can some one help me with these questions.. thanks in advance
may june 2013 qp 11
no 19,20 $27..

 

[Alice123]

can some one help me with these questions.. thanks in advance
may june 2013 qp 11
no 19,20 $27..

this is 2012

 

[aniroula]

this is 2012

sorry dude that is may june 2010

 

[Alice123]

sorry dude that is may june 2010

19. E=Stress/Strain =3x1o^8/5% =3x10^8/0.05=6x10^9

 

[Alice123]

this is 2012

20. Spring constant k=F/e.... think abt da gradient of the graph.... k=6/(1oo-70)x10^-3=200Nm^-1

 

[Alice123]

can some one help me with these questions.. thanks in advance
may june 2013 qp 11
no 19,20 $27..

27. Work done in a circular path=0