Biology; Chemistry; Physics: Post your doubts here!

[***amd***]

View attachment 43121

what is this slider?

 

[exploded diper]

Tou woh crack ke through kyun mahi ja sakti.....
So u mean tht first it had to travel longer distance bit sumhow due to crack it reflected back quicker.....
Right?

S is the pulse being sent R is the reflected pulse. Crack metal kay center main hai.
Jub pulse jaigi to half way say waapis aye gi. Is liye on oscilloscope it would be shown between S and R

 

[exploded diper]

Its a potential divider.....

what is this slider?

 

[***amd***]

Its a potential divider.....

i dont think it is in our syllabus. or is it?

 

[Ram97]

Tou woh crack ke through kyun mahi ja sakti.....
So u mean tht first it had to travel longer distance bit sumhow due to crack it reflected back quicker.....
Right?

Yup. Suppose a pulse take 2.5 seconds to go and reflect but at one point it takes 1 second then it means there is a crack present there.

 

[exploded diper]

B???

Yes...how explain urself

 

[exploded diper]

Yup. Suppose a pulse take 2.5 seconds to go and reflect but at one point it takes 1 second then it means there is a crack present there.

Wouldnt it oass theough the crack...u see i get vat u mean but i am not getting what kind of metal peoce its taling boht and the crack....

 

[Ram97]

Yes...how explain urself

Dekho it is in parallel. Parallel main bulbs are brighter.

 

[***amd***]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s13_qp_21.pdf
Q5 (c)
i got the answer 5 * 10^-10 but the ms says 2.5 * 10^-10, why?

Q10 (b) (ii), (iv)

Q11 (b) (i), (ii)

 

[exploded diper]

Dekho it is in parallel. Parallel main bulbs are brighter.

So wouldnt changing the position of the slider effect the circuit in anyway....yar ap to scientist niklay

 

[peacce]

Radioactive sources that emit beta-particles or gamma-rays are not used in smoke
detectors. State and explain two reasons for this. ??????????

 

[exploded diper]

Dekho it is in parallel. Parallel main bulbs are brighter.

How do we know its parallel

 

[exploded diper]

Radioactive sources that emit beta-particles or gamma-rays are not used in smoke
detectors. State and explain two reasons for this. ??????????

They r not very ionising...they r fast moving so will penetrate through easily...and cam cause mire harm...necuz aloha rays dont travel much far they dont harm

 

[exploded diper]

i think it is

 

[peacce]

thxxx

 

[Ram97]

How do we know its parallel

When the slider is at X it is making a parallel circuit

 

[peacce]

u're ryt as per the Ms

 

[***amd***]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s13_qp_21.pdf
Q5 (c)
i got the answer 5 * 10^-10 but the ms says 2.5 * 10^-10, why?

Q10 (b) (ii), (iv)

Q11 (b) (i), (ii)

somebaady plz!

 

[exploded diper]

Ram97
And can u answer the other one too bout the potentioal devider...
And it says tht uts going from x to y....what i thought wa tht ven it moves from x to y it will jabe more resistance and hence more vtage causing more brighter bulb and the other bulb will have less voltage so it should be less brighter...but this isnt right...?

 

[exploded diper]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s13_qp_21.pdf
Q5 (c)
i got the answer 5 * 10^-10 but the ms says 2.5 * 10^-10, why?

Q10 (b) (ii), (iv)

Q11 (b) (i), (ii)

u used the diameter .... use the radius..