Physics P22

[Aamer Faiyaz]

I think my exam went well. I have my doubts about the p.d. across CD and the power 60W question. I'm also hearing that the threshold will probably be around 43-45. Lets start discussing now shall we?

 

[akshay.RONALDO]

for power 60, u mean the last part for radioactivity? i don't remember the value of n exactly but it was a huge number something 1o^13.
what did u get for p.d across CD? maybe if u tell me ur answer, i might remember mine.;

 

[babycry]

i got 4.8v accross cd.. and yeah n was something *10^13 or something like dat

 

[Brian.Orwe]

Last question wass the easiest

 

[cowarrior]

yeah p.d and I1 both 3.2.
R=L/A so we can find resistance for 40cm long wire. We are given 10 ohm resistance for 1m so we can calculate the resistance for 40 cm long wire by using unitary method.
Across 4 ohm resistor voltage was 8 V. So 8-4.8 gives 3.2 V which is the required answer.

 

[cowarrior]

And guys which radiation emits in last question.....is it gamma ???

 

[babycry]

yeah p.d and I1 both 3.2.
R=L/A so we can find resistance for 40cm long wire. We are given 10 ohm resistance for 1m so we can calculate the resistance for 40 cm long wire by using unitary method.
Across 4 ohm resistor voltage was 8 V. So 8-4.8 gives 3.2 V which is the required answer.

isnt the resistor voltage also 12v since it is parallel so both wires have 12v from the power supply. so i said (x/0.4) =(12/1) to give x to be 4.8v. this was the potentiometer formula. if u use proptions u also get 4.2v since the current in the wire was 1.2A.

 

[creative22]

Guys please tell me how to make the graph in Question 1 !!

I mesed it I guess is this okay?

 

[creative22]

what the ratio b/w power dissipated was it 2:5

 

[creative22]

And guys which radiation emits in last question.....is it gamma ???

Yes gamma I wrote it too what was the next question regarding it ?

 

[creative22]

what was the Force in the string when it was released I wrote TENSION

 

[creative22]

Solids -regularly arranged closely packed
Polymer-Long chain of small molecules know as monomers
amorphous- irregularly arranged not closely packed

Is this Okay ?

 

[babycry]

what the ratio b/w power dissipated was it 2:5

i got 0.6

 

[Silent Hunter]

ratio was either 3:5 or 5:3 ..... i think... what was correct one?

 

[babycry]

ratio was either 3:5 or 5:3 ..... i think... what was correct one?

3/5 since power in wire was 14.4 and power in resistors total was 24. 14.4/24=0.6=3/5

 

[Kumkum]

3/5 since power in wire was 14.4 and power in resistors total was 24. 14.4/24=0.6=3/5

yes i got 0.6 also.

 

[cowarrior]

what was the Force in the string when it was released I wrote TENSION

correct

 

[cowarrior]

yes i got 0.6 also.

right

 

[cowarrior]

cor

Solids -regularly arranged closely packed
Polymer-Long chain of small molecules know as monomers
amorphous- irregularly arranged not closely packed

Is this Okay ?[/qu

Solids -regularly arranged closely packed
Polymer-Long chain of small molecules know as monomers
amorphous- irregularly arranged not closely packed

Is this Okay ?

absolutely correct

 

[cowarrior]

isnt the resistor voltage also 12v since it is parallel so both wires have 12v from the power supply. so i said (x/0.4) =(12/1) to give x to be 4.8v. this was the potentiometer formula. if u use proptions u also get 4.2v since the current in the wire was 1.2A.

potentiometer formula cannot be used because potentiometer is the device which is used to compare between emfs. Since there is 12V emf, potentiometer formula cannot be used in my opinion.