hey noobie physic AS mcq here :D

[kirashinagami]

hi, please help me with these phy question, thanks..

 

[yubakkk]

same material have same young modulus so equate young mod.1=young mod.2 u will get 8mm

 

[Zishi]

hi, please help me with these phy question, thanks..

For first one, remember that resistance is not the reciprocal of the gradient to I-V graph. Join each of the points to origin through a straight line, the line whose gradient will be largest will have the smallest resistance.

For 2nd one, use dsin(theta)=nλ and out angle=30 degrees.

Other people may explain other questions, right now I'm bored and tired of explaining same questions again and again, so you've to wait for them. ardon:

 

[hassam]

for 24 use the fact that intenisty is proportional to A^2*f*2....both amp. and frequency

 

[workinghard]

for diffraction gratings u take dsinQ=nL(lambda)
(1.15 x 10^-6)sin30 = 1(L)
L = 575nm da trick is 2 halve da angle ... simialr ques is in p2 pr of i guess j02 or something like dat...

 

[kirashinagami]

a lot of thanks to yubakk zishi hassam and working hard. i really appreciate it

 

[yubakkk]

u r always welcome