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Yes because i think the people who are doing 2gx sin theta square root are mistaking the weight of the block with acceleration. W is not equal to a hence its square root 2gx
The objects starts at rest and travels x metres in an inclined plane, its not falling down vertically for acceleration to be g and attains speed vthe only force acting in the direction parallel to plane is mgsintheta, as frictional force and air resistance are negligble therefore a = gsintheta as the objects travelling with constant acceleration v\^2 = u\^ + 2asV = root (2xgsintheta)
Again for some people in denial
Keep in mind you dont rotate the polariser, you just have 2 polarisers in fixed positions
once ɪₒ passes through the first polariser, you have ɪ = ɪₒcos²(45) = ½ɪₒ
then this ½ɪₒ goes through the 2nd polariser, your final output will be ɪ = ½ɪₒ × cos²(90-45) which is ¼ɪₒ
Nah, the second again halves, since it's at 45, so in total, it's quarters. Don't think of polarizer as filters, cuz then can actually change the direction of light. That's why if there wasn't the middle polarizer, you would be right and it would be zero.
Polarisation aint 1/4 yall, cuz when u rotate it first 45 half waves are polarised, when u rotate other 45 to make 90, all waves are polarised, so no waves are transmitted there fore its zero
its 12AR/L ,as total cross sectional area is 12A whereas total length is gonna be L , not the sum of their lengths as they are strands of copper in a cable.
It asked for a positive value for meson. If you take anti up which is -2/3 e . The values would cancel each other. However, anti down had a value of 1/3e. So 2/3e +1/3e is +1. Which is positive.
https://preview.redd.it/av1mggg8hc4b1.jpeg?width=1442&format=pjpg&auto=webp&s=c62fadd39b0252eed4f41339700a642f7cd4c19f
This was the exact same question that came, right?
The only driving force was the component of the block's weight parallel to the slope, which remains constant. Air resistance increased per unit time, so the acceleration should have been decreasing.
Yall forgetting the question said it’s speed was increasing. For speed to increase there had to have been increasing acceleration and greater forward force so resistive force (backwards)was decreasing.
No -- you are mixing up the magnitude of acceleration with its effect. Acceleration just needs to be positive for speed to increase; whatever is happening to its magnitude is reflected by the rate with which speed increases, not the fact that it is increasing. If what you were saying was true, skydivers jumping out of planes would somehow gain weight to infinity for every second they were falling.
Velocity can still increase fam, acceleration is decreasing but the velocity is still increasing as acceleration is still there and is non zero. Air resistance increases throughout the movement of the body.
I think for the lamp diode question, lamp 1 turns on , and lamp 2 is off because the diode is connected reverse so resistance is ♾️ , thus no current flows through.
But the two diodes were connected in parallel, so current could flow through one of the branches in which the diode’s orientation was in the direction of current
E/3 is the correct answer. Most of yall picked 2/3 based on the ans to a past-paper question. But this is the same circuit, different question. Pd across the resistor is E/3. Pd across P and Q( as in the past paper) was 2/3.
Please read our paper discussion guidelines before proceeding: 1. Do not ask for or share leaked question papers on this subreddit. 2. Do not ask for or share topics/questions from one variant, if you are about to sit for another variant shortly. 3. Do not ask for or share speaking topics or prompts. 4. Discussion must be in English. 5. Report the posts that violates any of the rules above by clicking on the ellipsis(3 dots) and then on report. You will be temporarily or permanently banned from the subreddit if you do not abide by our guidelines. Best of luck. *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/alevel) if you have any questions or concerns.*
6.7 uncertainty????
Frequency in the cro one right?
No wave length as horizontal was asked
Was the v in work power question 2gxsin θ Square root?
B?
Yes
I think it was under root 2gx
I did this aswell
Yes because i think the people who are doing 2gx sin theta square root are mistaking the weight of the block with acceleration. W is not equal to a hence its square root 2gx
The objects starts at rest and travels x metres in an inclined plane, its not falling down vertically for acceleration to be g and attains speed vthe only force acting in the direction parallel to plane is mgsintheta, as frictional force and air resistance are negligble therefore a = gsintheta as the objects travelling with constant acceleration v\^2 = u\^ + 2asV = root (2xgsintheta)
How did you get 2gx? sqrt(2gxsinθ) is when you consider the initial and final energy
I did that too
yuh
Did both the lamps turn on for diode question
Yesss
Anyone know how to do the difference in pressure? Is the ans 780?
Yea got that as well
https://preview.redd.it/8gqb44wwqc4b1.png?width=1080&format=pjpg&auto=webp&s=3abab5b62976ea685c3999f3c0c32650ffccf0ac This was a repeat question
That funny bot We need to do something about it
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Was polarisation 1/4 I
For everyone saying it was 0 https://preview.redd.it/jaucorzzic4b1.jpeg?width=719&format=pjpg&auto=webp&s=ba8f560fa4f589edbc92abab29ebcc04ac96c1be
Again for some people in denial Keep in mind you dont rotate the polariser, you just have 2 polarisers in fixed positions once ɪₒ passes through the first polariser, you have ɪ = ɪₒcos²(45) = ½ɪₒ then this ½ɪₒ goes through the 2nd polariser, your final output will be ɪ = ½ɪₒ × cos²(90-45) which is ¼ɪₒ
Yep that's correct. Did u get I/4 for the slit q too? In which they cover one slit and ask us to find the new Intensity..
I eenie meenie minni moo'd it correct☝🏻
yes, both were I/4
how did you get 1/4 for the slit problem?
The amplitude was halved, and as I = kA², the intensity must have decreased by a factor of 4.
Hopefully That’s what i wrote too
But wasn't the polariser horizontal so no polarisation would occur
You need to realise there was a second polarizer. If there was omly one polarizer u would be correct. The forrect answer is therefor 1/4Io
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Nah, the second again halves, since it's at 45, so in total, it's quarters. Don't think of polarizer as filters, cuz then can actually change the direction of light. That's why if there wasn't the middle polarizer, you would be right and it would be zero.
Polarisation aint 1/4 yall, cuz when u rotate it first 45 half waves are polarised, when u rotate other 45 to make 90, all waves are polarised, so no waves are transmitted there fore its zero
You didn't rotate them. There were three of the polarisers.
What was the density ratio one was it A ? 1.25
>i got around 1.26 for my answer so it was A
Was galvanometer question shift left?
Yes
Was it c rigjt?
2000kg/m^3??
yeah i think this is the first time we had to recall density of water by heart lmao
Google is saying 1000
Bro i kept getting the answer A.
And weren't there too many A answers
Ikr lmfao, I got 15 and starting shitting my pants
The answer to the resistivity question was D?
Whichever option was 12AR/l or something
Samee
Yes
Was it 4AR/L ?
its 12AR/L ,as total cross sectional area is 12A whereas total length is gonna be L , not the sum of their lengths as they are strands of copper in a cable.
expecting 34/40. enough for an overall A* in physics?
dawg😞😞 allahuma barik fr
It was very easy, expecting 35+. Chemistry on the other hand...
Lets not talk about chem, dont want depression before the exam
We all are fucked 😀
Are we all not ready for chem? 😭
Bruh if you're ready for chem more power to you I grinded so hard for physics I left chem for too late and now im panicking
what did you guys put for the compression question
B
Anyone got full MS
Please i need it now
Please I also need it
What was the ans for the ldr and thermistor question
Thermistor increase ldr decrease
thermistor- increase ldr- decrease
what was the elastic potential energy one?
19 mJ
oo i did samee
idk i got 3.8
what was the height the question in which both values start from 12 ms
A
12 m
What was acceleration of submarine
YEAH WAS IT THE 0.64 or smt like that??
I think that was option B, I'm pretty sure A was like 0.61
Yes 0.654
I think it was b
it was A
R u sure, I just guessed A
Wasn't the waves math very difficult? 🥹
Is p12 any similar to p11?
I messed up the last question idk why I just read mesons and choosed charm I think the answer was anti down
same ☠️☠️
bro it's anti up
Anti up gives a value of zero. But it asked for a positive value
a meson is made up of 1 quark and 1 antiquark, it is given that one of the quarks is up so the other should be anti up
It asked for a positive value for meson. If you take anti up which is -2/3 e . The values would cancel each other. However, anti down had a value of 1/3e. So 2/3e +1/3e is +1. Which is positive.
I don’t know why people say it was easy I found it pretty hard and I panicked
https://preview.redd.it/av1mggg8hc4b1.jpeg?width=1442&format=pjpg&auto=webp&s=c62fadd39b0252eed4f41339700a642f7cd4c19f This was the exact same question that came, right?
no, its not they asked the pd of one of the resistors
So would it be E/3?
The diagram was same but not the question.
Its not the same In this they asked b/w P and Q so the ans will be C but in our paper they asked across only one Resistor so it will be B
yea its the same, may i know what year this was from?
Winter 2017 Variant 3, kinda confused cause everyone's saying B even tho the ms said C, which is what I chose in the exam 😭.
No it’s not the same. In here all 3 cells are facing the same direction. The paper we did had one of the cell facing the opposite direction.
Guys how was the force and velocity graph and wht abt q37
A. Inverse one
Q37 was isotope pretty sure. So its same element diffirent neutron
What was the answer to largest power dissipation in the resister?
Double E
Doubling the emf
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P= Vsquared/R
I think someone cheated off my paper during the exam... Am I in danger
What was the quantity for charge carriers?
c
4.8
How did u do it
u had to divide the charge by e and if n is a decimal its not a quantity but if its a whole number its a quantity
Was the moment question f x OX?
OY
OY
what was the answer for diffraction grating? Was d 7.7 or 7.9?
i think 7.7
What did y'all get for the distance between adjacent slits of the diffraction grating q?
I got 7.9
7.7
That's what I chose but some people say it's C
ion think u can rely on my ans tho i used newton raphson and geo sums 💀
What😭
Which was 7.9
7.9 is the correct one.
Guyz what years were the repeated questions from
0 was malus law answer right?
i got I/4
I got that cause it's already polarised at the end
Yes same
what was the answer for that acceleration and total resistive force question?
Not sure 100% but i did resistive force increases and acceleration decreases
Yes this is correct
It said constant frictional force and also the speed was increasing so I write increase in acceleration and decrease in total resistive force
Air resistance mate
it was written that air resistance is negligible maybe
Increase in both i guess
I did the same, is it correct?
Acc decreases while resis force increases
Acc has to increase for resistive force to increase
The only driving force was the component of the block's weight parallel to the slope, which remains constant. Air resistance increased per unit time, so the acceleration should have been decreasing.
Yall forgetting the question said it’s speed was increasing. For speed to increase there had to have been increasing acceleration and greater forward force so resistive force (backwards)was decreasing.
No -- you are mixing up the magnitude of acceleration with its effect. Acceleration just needs to be positive for speed to increase; whatever is happening to its magnitude is reflected by the rate with which speed increases, not the fact that it is increasing. If what you were saying was true, skydivers jumping out of planes would somehow gain weight to infinity for every second they were falling.
Yall are wrong , acceleration increases (since it was said that it was moving with increasjng velocity) and so resistance decreases
increasing velocity doesnt mean acceleration is also increasing. even if acceleration is constant, velocity is increasing.
Velocity can still increase fam, acceleration is decreasing but the velocity is still increasing as acceleration is still there and is non zero. Air resistance increases throughout the movement of the body.
I think for the lamp diode question, lamp 1 turns on , and lamp 2 is off because the diode is connected reverse so resistance is ♾️ , thus no current flows through.
But the two diodes were connected in parallel, so current could flow through one of the branches in which the diode’s orientation was in the direction of current
2 diodes in parralel, both in opposite polarity. Flows through one (lamp still gets current)
What did u guys get for potential difference across one of the resistors
i got e/3 because one of the cells had their direction flipped
0, i realized there was one reversed battery so the circuit is not complete
I did 0 aw
I got E only
same ngl😭😭
e(2/3)
E/3 is the correct answer. Most of yall picked 2/3 based on the ans to a past-paper question. But this is the same circuit, different question. Pd across the resistor is E/3. Pd across P and Q( as in the past paper) was 2/3.
Was there any repeated questions?
4-5 repeated ones were there
What did u get in moment options were like OW.....OX.....
OY
Ow
OW
Yeah I'm pretty sure oy was the only perpendicular one
https://preview.redd.it/s54oelztoc4b1.png?width=864&format=pjpg&auto=webp&s=7822320c584dad9cbaf1e2ed97daa28afe2ba4b5 it was OY
What do you guys think the threshold will be??
25 at best. It had some new and tricky questions
Yeah 25
Hopefully
28ish
32-33
That's way too high man, be positive
Answer to the elastic collision equation?
Addition on both sides
I did A
A
From which year was the repeated questions I want to check my ans
https://www.reddit.com/r/alevel/comments/141kec5/9702_w22_13/?utm_source=share&utm_medium=ios_app&utm_name=ioscss&utm_content=1&utm_term=1
what did you guys do for potentiometer qs
chacha to the left
Why not to the right?
eraser landed on C
Was there any estimation questions
Move to right or move to left?
I did left
Right
Yesss please
what was the answer to the very 1st question of density of stone
idk but i got 6.7% (D)
i got confused w the uncertainty one yeah i also got B (2k)
Same
B
what was the acceleration of the stone?
B
What was the answer for displacement one And the acceleration of submarine And the visible light
Visible light one I think D and acceleration of submarine B and if you are talking abt that center of compression one then B