ALL CIE PHYSICS DOUBTS HERE !!!

[SZM]

in our edexcel, we dont have practical part. I mean unit 1, 2, 4, 5 are theory part, but unit 3 and 6 are written practical papers..... that means we wont have practical, where we have to do in lab, we have written practical papers, so we have to study the practicals notes very much. For that obviously i have to attend the class, i need teachers explaination to apply knowledge whn they ask to investigate or design the experiment. For that self study wont work, as i know very well, so needs teacher Help.

wat do u think??/

here, u said u r giving AS exam now, which means u will be doing exam in october??? am i correct??? wat do u mean by 4 given up 6 remaining??? cant understand very well?
pls explain me in details

need ur reply urgently

[SZM]

ahhhhhhhh i got wat u mean//// hey u r hving exams  noww? Oh My God. May God succeed ur exam with best results.

here, u said, Self study is perfectly suitable for theory part. Ow cn u say??? r u sure about that 100 percent???
dear tel me ow to achieve A* for math, phy, chem and bio??? wat is the successful method to achieve this grade???/

which materials should i start with??? ow to cover up everything, becoz i will be doing both AS and A2 exam in May.. So i wil have 5 months more.

i think i have t spend 3 months to study the concepts in all units well along with some questions and another  2 months , i ahve to spend to do loads of pastpaper// ow wat should i do?

[ashwinkandel]

Hey It all depends upon you. How much effort you put into your studies. I don't know about Edexcel book but for CIE i can refer you the books and materials that cover the syllabus : For CIE : Physics>> Cambridge International AS and A level Physics Coursebook; Chemistry: Cambridge International AS and A level Chemistry Coursebook & Calculations in A and AS level Chemistry by Jim Clark, Maths>> Maths books prescribed by CIE and about BIO i don't know as i have not taken it.

[SZM]

@ ashwinkadel, u said, that self study is perfectly suitable for theory part no. Thats all i want from u. if dat is so, then ok?

waitin for ur reply

[SZM]

here today i went for math class, my teacher told me, that in edexcel, we have C1, C2, C3, C4 , M1 and M2. Ok. Then she told me, after finishing a particular topic by doing mixed and review exercise, she told me do questions based on that topic from the pastpaper to become more confident. SO i should not wait after completing all topics from C1 and then do pastppaer. She said no to do dat way. Wat do u think??

if dat is gud, cn i follow for other subjects such as phy,chem and bio??? will that method suitable??

need ur reply urgrntly

[astarmathsandphysics]

She is right but you can do questions from book instead of past papers

[ashwinkandel]

Hello Sir(astarmathsandphysics) As per the previous question for ii) one is more spread out than the other. The spectrum on the left is brighter than the one on the right. Can you explain me the reason why one is more spread and brighter.

[astarmathsandphysics]

yes.The spectrum forms an envelope like in a double slit.

within each bright spot the cours spread out tp form a rainbow which is why you get different coloured fringes.
Neaer the edges, since we are projecting onto a flat surface, the image spreads out.

[ashwinkandel]

Question from Radioactivity:
Q.Approximate values for the radius of a gold atom and the radius of a gold nucleus are 10^-10 m and 10^-15 m respectively.
a. Estimate the ratio of volume of a gold atom to the volume of a gold nucleus. [2]
b. The density of gold is 19000 kg/m^3. Estimate the density of a gold nucleus stating any assumptions that you make in your answers.[3]

[ashwinkandel]

Help needed immediately for this question and above posted question as my Physics Paper 2 is on 16th Nov.
Questions from States of Matter:
1.
a. Explain how a manometer may be adapted to measure large pressures.
b. Explain why the pressure measured by manometer does not depend on the cross-sectional area of the tube used in the manometer.

2. A boy stands on a platform of area 0.050 m^2 and a manometer measures the pressure created in a flexible plastic container by the weight W of the boy.  The density of water is 1000 kg/m^3/ Determine
i. the pressure difference between the inside of the plastic container and the atmosphere outside. [2]
ii. the weight W of the boy. [2]

3.The diagram shows a U-tube, open at both ends, which contains two different liquids X and Y that do not mix. The numbers on the metre rule are distances in centimetres. The density of liquid Y is 800 kg/m^3
i.Explain how diagram shows that liquid Y has a greater density than liquid X [2]
ii. Calculate the density of X. [3]
iii. Explain why the pressure in the U-tube is the same on the both sides of the manometer at the level L. [1]
iv. Calculate the pressure caused by liquid in the U-tube at level L. [2]

[astarmathsandphysics]

the gold atom question answered in attachment

[astarmathsandphysics]

the manometer questions

[ashwinkandel]

I have 5 MCQ's from Past Papers. I am not able to solve these questions. I have attached the answers and questions below. Can someone please give me explanation for each question.

[astarmathsandphysics]

1st one. If one spring is removed the weight is supported by 2 spring instead of 3 so extension is multiplied by 3/2 . If the weight is doubled then the extension is also doubled so extension is 3x.

[astarmathsandphysics]

2nd. If no friction is present the minimum work done will be the increase in graviational potential energy =mgh=50*9.8*1.6 =780J