Physics, Chemistry and Biology: Post your doubts here!

[white lie]

What the hell!!!!!!!!!!!!!!!!!!!!
What is half-life????????????????????????????????????????????????????????

 

[Othman]

What the hell!!!!!!!!!!!!!!!!!!!!
What is half-life????????????????????????????????????????????????????????

It is the time for half the substance to decay.

 

[white lie]

c

It is the time for half the substance to decay.

n u plz elaborate!!!!!!!!

 

[Othman]

c

n u plz elaborate!!!!!!!!

Lets say the sample is 100g, after 2 days it becomes 50g. The 2 days is the half life then after that 2 more days the sample becomes 25g.

 

[white lie]

alllrigghhhttt ..... N Wat are Transistors??????
is it a semiconductor device??????????????????????????????????

 

[white lie]

M i right?????????????????????????????????????????????????????????

 

[Othman]

alllrigghhhttt ..... N Wat are Transistors??????
is it a semiconductor device??????????????????????????????????

Paper 1 is core only, transistors are not included in it.

 

[white lie]

so what i cant get knowledge about it ???????????????????????????????????????

 

[Othman]

so what i cant get knowledge about it ???????????????????????????????????????

You should've studied it for P3, now it's useless information...

 

[white lie]

(((((((((((((((((((((((((((((((((((((

 

[omaaaar]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s12_qp_11.pdf
Q8 how is the answer C,the upward and downward forces are equal so the handle shouldnot move
Q10 why gravitational energy ,at point Y gravitational energy will be zero
Q18 in convectiondoes the liquid expand or the molecules in the liquid will expand
Q23 could you tell about the characteristics of the image formed by a plane mirror
Q33 could you explain no idea​

 

[nononona]

can somebody plz exlpain q 17 in may/ june 10 v 11

 

[nononona]

*explain sorry

 

[nononona]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s12_qp_11.pdf​

Q8 how is the answer C,the upward and downward forces are equal so the handle shouldnot move ​

Q10 why gravitational energy ,at point Y gravitational energy will be zero​

Q18 in convectiondoes the liquid expand or the molecules in the liquid will expand​

Q23 could you tell about the characteristics of the image formed by a plane mirror​

Q33 could you explain no idea​

Q8 because the anticlockwise moments are more than the clockwise moments seen as moments = force * distance and the distance to the right are less it s about the moments clockwise or anticlockwise the upward and downward forces dont matter here
Q10 it is above the ground so there will be gravitational potential energy
Q18 the liquid is the one that expand
Q23 the image is virtual that is it cant be displayed on a surface t is also laterally inverted that is it is inverted from left to right and lastly it is not enlarged it is the same size
Q33 at R are it is not connected to the negative terminal so the voltage is zero but when we move it to S it will be connected in parallel with the resistor so it will show the voltage of the battery

 

[Othman]

can somebody plz exlpain q 17 in may/ june 10 v 11

Not A; because at X it is dropping faster than Z.
Not B; Some of the wax is still liquid in Y.
Not D; Even in solids molecules move " vibrate ".
It is C; Energy is given out to become a solid this is the opposite when energy is taken in t become a liquid/gas.

 

[nononona]

Not A; because at X it is dropping faster than Z.
Not B; Some of the wax is still liquid in Y.
Not D; Even in solids molecules move " vibrate ".
It is C; Energy is given out to become a solid this is the opposite when energy is taken in t become a liquid/gas.

oh ok thanks alot

 

[Othman]

oh ok thanks alot

No problem.

 

[omaaaar]

Q8 because the anticlockwise moments are more than the clockwise moments seen as moments = force * distance and the distance to the right are less it s about the moments clockwise or anticlockwise the upward and downward forces dont matter here
Q10 it is above the ground so there will be gravitational potential energy
Q18 the liquid is the one that expand
Q23 the image is virtual that is it cant be displayed on a surface t is also laterally inverted that is it is inverted from left to right and lastly it is not enlarged it is the same size
Q33 at R are it is not connected to the negative terminal so the voltage is zero but when we move it to S it will be connected in parallel with the resistor so it will show the voltage of the battery

Could you elaborate your answer to Q33

 

[omaaaar]

And yes thanks to both of you for answering

 

[Al-Anoud]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w12_qp_13.pdf
qs. 24
cud someone please help
IGCSE physics paper-1