How did Physics P2 go?

[Manalz]

What did you guys find confusing? The CRO part was a bit tricky.

 

[Zaki ali asghar]

I got the cro right but i guess messed up in that destructive interference of water waves

 

[rajveer__]

what was the wavelength for the fringe question?

 

[Zaki ali asghar]

4.5^10-7

 

[Sanaisnotanerd]

Guys which definitions were asked????

 

[Mohammed Yousuf]

Guys for P22 who got the velocity questions right? And what was the p.d between A and B?

 

[Hassan (SHT)]

Velocity was 5.76 ms^-1 equivalent to 5.8 ms^-1,
Angle was 59 degree, pd across AB was 1.46, efficiency was 97.6%

 

[husnain99]

what was the ans for momentum question ? ( -60/200 : O.3 ) ? This is what i got
plus for nuclear phy are these 2 differences valid?
: 1) in beta negative , electron is formed while in beta positive , positron formed. 2) antineutrino vs neutrino.

 

[Zaki ali asghar]

Velocity one was easy,in the momentum one speed was o.30 ms^-1

 

[sadaksldjsa]

Velocity was 5.76 ms^-1 equivalent to 5.8 ms^-1,
Angle was 59 degree, pd across AB was 1.46, efficiency was 97.6%

SPOT ON. What did you guys do in the wave question? The first one was destructive right because path diff of 3.4 or something, then when the phase diff was 180 the two waves would allign and would create constructive interference.

 

[sadaksldjsa]

Velocity one was easy,in the momentum one speed was o.30 ms^-2

Yup yup. Though Im not sure if I put the sign correctly. I put +0.3 while a friend of mine put -0.3. idk

 

[Zaki ali asghar]

no you werentt supposed to put up sign in the answer itself as it demanded only magnitude.

 

[Farjad Ilyas]

SPOT ON. What did you guys do in the wave question? The first one was destructive right because path diff of 3.4 or something, then when the phase diff was 180 the two waves would allign and would create constructive interference.

Yeah correct. What about the third one? When the intensity of one of them is decreased? I wrote that the displacement at P will be equal to the difference in displacement of D1 and D2

 

[sadaksldjsa]

Yeah correct. What about the third one? When the intensity of one of them is decreased? I wrote that the displacement at P will be equal to the difference in displacement of D1 and D2

Yay. Man I did that intensity question like 5 hours before the paper started. It came up in oct nov 2016 variant 22. The bright fringes become darker and the dark fringes becomes brighter according to oct nov 2016s mark scheme. I had learned it by heart because I didnt understand why the bright fringes become darker. So the point at P or whatever the destructive interference point was will become brighter. And then all the other bright fringes would become darker.

 

[sadaksldjsa]

In that question on why kinetic is not equal to gpe. The answer was that the object is in projectile motion right? I wrote down that only in linear motion is all of gpe converted to ke. And this object is in projectile motion so it will convert to other forms.
Looking back, I should have just written change in height is not directly proportional to speed...

 

[Farjad Ilyas]

In that question on why kinetic is not equal to gpe. The answer was that the object is in projectile motion right? I wrote down that only in linear motion is all of gpe converted to ke. And this object is in projectile motion so it will convert to other forms.
Looking back, I just have written change in height is not directly proportional to speed...

The object already had an initial horizontal velocity v, so it had K.E before it started to fall. So all of the final K.E isn't equal to the conversion of G.P.E to K.E

 

[sadaksldjsa]

The object already had an initial horizontal velocity v, so it had K.E before it started to fall. So all of the final K.E isn't equal to the conversion of G.P.E to K.E

gah, im so stupid. Why didnt I think of that...
I was kinda sad 2d collisions didnt come. Its normally free marks.
Particles and nuclear was really easy too. It was on the last page of the exam and I was looking at it before the exam started. So I did that question first.

 

[sarmadimran]

The object already had an initial horizontal velocity v, so it had K.E before it started to fall. So all of the final K.E isn't equal to the conversion of G.P.E to K.E

I wrote about final horizontal velocity rather than initial that when it hit the floor it had some horizontal velocity...is it wrong?

 

[Farjad Ilyas]

I wrote about final horizontal velocity rather than initial that when it hit the floor it had some horizontal velocity...is it wrong?

It might be correct because horizontal velocity is constant so they might accept final horizontal velocity - as long as you mentioned that G.P.E only affects vertical velocity though.

 

[sadaksldjsa]

it was for only 1 or 2 marks anyways so dw dude. As long as the rest of your answers are matching

Can someone please tell me how TF was that k = EA/l question for only 4 freaking marks? All of the unit conversions were kinda confusing. Answer was 1 point something tera units.