Biology; Chemistry; Physics: Post your doubts here!

[funky brat]

How do we know if it's A or B? :/

 

[Faizan Muhammmad]

Can somebody explain with the aid of a diagram how total internal reflection occurs in Optical fibres, with clear angle of incidence etc.

 

[funky brat]

is it really necessary to use H OR HB pencil for mcq's i mean cant we use 2HB, cause i used it in biology p1

Lol, I think that easier ti erase islye.

 

[Faizan Muhammmad]

Yeah but that's sensitive too, how?

change in volume per unit change in temperature is higher

 

[Dark Destination]

View attachment 43056
How do we know if it's A or B? :/

Direction of magnetic field.

 

[Faizan Muhammmad]

View attachment 43056
How do we know if it's A or B? :/

grip rule genius

 

[funky brat]

grip rule genius

Wohey to nahi ata. Can you explain?

 

[kirann]

I didn't even see which pencil it was

BARDA BARDA likha tha answer sheet pe

 

[funky brat]

change in volume per unit change in temperature is higher

Yeh to mje bhi pata hai.

 

[kirann]

Wohey to nahi ata. Can you explain?

 

[asadalam]

Wohey to nahi ata. Can you explain?

Paper mai ek din reh gya hai bibi aur tum abhi tak inhi chakron mai hoon

 

[FLRNAB]

Anyone has star formation notes?

 

[asadalam]

Anyone has star formation notes?

Anyone has star formation notes?

• The gravity of cloud causes the cloud to collapse to a center. As the hydrogen condenses into star, the gravitational energy released causes the center to heat up. And this heat and weight of hydrogen provides an environment in a core of proto star, in which fusion occur. Due to fusion mass is converted into energy and proto star become STAR.

 

[Faizan Muhammmad]

Yeh to mje bhi pata hai.

phir?
main kya btaon??

 

[funky brat]

Paper mai ek din reh gya hai bibi aur tum abhi tak inhi chakron mai hoon

I had some confusion because I forgot yeh manhoos rule.

 

[Abdul Hanan]

Anyone has star formation notes?

STAR FORMATION:
-there is star dust in space
-when these dust particles pass closer to each other they start attracting each other (gravitational force)
-they come close to each other in a spiral motion (spiral inwards)
-as they are coming closer, their speed is increasing and they collide with each other with much higher speed so that the nuclei of one surface fuse with the nuclei of other surface i.e a fusion reaction starts.
-energy is emitted in shape of light and a star is formed

 

[princess Anu]

Q10 a (iii)
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w10_qp_22.pdf

If someone could help me with this please?

 

[DaniyalK]

If someone could help me with this please?

Here's a sketch of the vector diagram. Draw it accurately with an appropriate scale and you should get the correct answer.

 

[princess Anu]

Here's a sketch of the vector diagram. Draw it accurately with an appropriate scale and you should get the correct answer.

thanks! I was confuse with the 10 degree upward slope thing

 

[princess Anu]

Any suggestions on how should i manage my time for tomorrow's theory paper ?