Physics: Post your doubts here!

[Zepudee]

Brightness of fringes increases? I think it decreases my friend.Pls check .
Reason-Distance traveled by the wave increases as order number increases.

Aw thank prince ALI

 

[Haya Ahmed]

Guys can some PLEASE gimme a detail bots in the internal energy .. I always get confused ..
Like what I want is what happens to the K.E and the P.E .. As the change in state takes place.. Like from solid to liquid as well as liquid to gas.. DETAILED
Thank u
Please help

well .. internal energy is the sum of the random KE and PE of all particles of a substance
KE depends on the temperature and PE depends on molecular sepration
So when temp increase ... KE increase so Internal energy increase and vice versa and same goes to the PE ... more te molecular sepration more PE more internal energy

 

[Princess Raven]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s13_qp_22.pdf

guys how are we suppose to do q 5part b iii i dont get how we r suppose to draw the new wave

 

[DeViL gURl B)]

well .. internal energy is the sum of the random KE and PE of all particles of a substance
KE depends on the temperature and PE depends on molecular sepration
So when temp increase ... KE increase so Internal energy increase and vice versa and same goes to the PE ... more te molecular sepration more PE more internal energy

Thank you soo much!

 

[Suchal Riaz]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w09_qp_21.pdf
q5(c)

Here you need to draw labelled diagram of source of light, apparatus to diffract/interfere and how to observe it.
To observe the diffraction the light must be perpendicular to the slit and the screen must be long distance from slit
to observe. we will decrease slit separation(in (ii) ) and slit width in (i) part.
(i) when we will decrease it, the the spot will start to spread into geometric shadows. along the bright big spot a few fringes will also be observed but they will be dim.
(ii) the fringe seperation will increase. alternate bright and dark fringes will be produced.

 

[doremon]

can anyone please explain Q4 c ii) 2. from
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w09_qp_22.pdf

it's simple. you already know the weight of the load just simply multiply it with the extension(17.8-16.3)

 

[Haya Ahmed]

Suchal Riaz I'm waiting for the diagram of http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w12_qp_23.pdf
Q1 e i and ii

 

[DeViL gURl B)]

well .. internal energy is the sum of the random KE and PE of all particles of a substance
KE depends on the temperature and PE depends on molecular sepration
So when temp increase ... KE increase so Internal energy increase and vice versa and same goes to the PE ... more te molecular sepration more PE more internal energy

So we can say that when a solid turns into a liquid .. The internal energy increases cuz there is an increase in the temp as well as the molecular separation. Right?

 

[princeali97]

IS THIS OK?

 

[ZaqZainab]

can anyone please explain Q4 c ii) 2. from
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w09_qp_22.pdf

P.E=mgh
weight=mg
so P.E=weight*height

 

[Haya Ahmed]

So we can say that when a solid turns into a liquid .. The internal energy increases cuz there is an increase in the temp as well as the molecular separation. Right?

Yep ..

 

[doremon]

IS THIS OK?

which year is this from?

 

[ZaqZainab]

IS THIS OK?

i would say yes

 

[Haya Ahmed]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w12_qp_23.pdf
Q 1 e both i and ii
and Question 2 a ii

 

[Suchal Riaz]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w12_qp_23.pdf

Q1 e (i),(ii) should we convert the speed into forces ? please someone explain ! .. thanks

Suchal Riaz

now use the cosine rule. angle is 90+45. scale drawing will not give accurate result because the velocity of wind gives 1.8cm only if i took 1 cm = 20 m/s

 

[_Ahmad]

it's simple. you already know the weight of the load just simply multiply it with the extension(17.8-16.3)

but I am not getting the answer

 

[doremon]

can someone please help me with phase difference?

 

[Suchal Riaz]

kitkat <3 :P
Please solve them simultaneously i have to solve other doubts

 

[kitkat <3 :P]

now use the cosine rule. angle is 90+45. scale drawing will not give accurate result because the velocity of wind gives 1.8cm only if i took 1 cm = 20 m/s

but the arrowhead is in different direction :/ i mean wont it affest the triangle

 

[kitkat <3 :P]

kitkat <3 :P
Please solve them simultaneously i have to solve other doubts

sure