Biology; Chemistry; Physics: Post your doubts here!

[bogus]

Which zone is for us?

12 for papers 4 for datesheet

 

[fatikhalid]

divide the wave length by frequency and u will get the time taken by the spot to cross the screen
the wave length is 1.5 and the frequency is 0.5, the result is 3 seconds

thankyou sooooooooo much!!!!!!!!!

 

[batool]

thankyou sooooooooo much!!!!!!!!!

ur welcome

 

[fatikhalid]

divide the wave length by frequency and u will get the time taken by the spot to cross the screen
the wave length is 1.5 and the frequency is 0.5, the result is 3 seconds

but how can v get time by dividing wavelength by frequency??

 

[batool]

but how can v get time by dividing wavelength by frequency??

frequency = 1/time, i guess by rearranging the formula.

 

[farahdar]

I have a problem solving questions relating 'equilibrium'..its not in our book..and our teachers gone somewhere abroad till july..any that can help?

 

[multixamza01]

I have a problem solving questions relating 'equilibrium'..its not in our book..and our teachers gone somewhere abroad till july..any that can help?

post a question you find difficult

 

[farahdar]

post a question you find difficult

not a particular question..the topic

 

[multixamza01]

not a particular question..the topic

Check this link and see if it helps :
http://www.xtremepapers.com/revision/gcse/chemistry/reversible_reactions.php

 

[Ali_00921]

Difference between Ac and Dc motors...
how can we use Fleming's left hand rule in these motors??

 

[multixamza01]

Difference between Ac and Dc motors...
how can we use Fleming's left hand rule in these motors??

For AC generator we use Flemming's Right Hand Rule .

For DC Motor we use Flemming's Left Hand Rule .

Both Rules are the same , only the concerned hand changes .

 

[Ali_00921]

Magnetic field is from right to left yea?
And ain't there any difference in the diagram of ac and dc motor?
Thank ya so much..

 

[multixamza01]

Magnetic field is from right to left yea?
And ain't there any difference in the diagram of ac and dc motor?
Thank ya so much..

magetic field is from north pole to south pole .

and yes there is a difference in the diagram .

 

[scouserlfc]

Difference between Ac and Dc motors...
how can we use Fleming's left hand rule in these motors??

Just for identifying purpose when to use right or left rule just remember this if u dont know whether its ac or dc,just see if u are supplying the current then its a simple motor and the motor rule applies which is the left hand rule while if u dont supply current and u are producing it then its the dynamo rule which is right hand rule !

 

[multixamza01]

Just for identifying purpose when to use right or left rule just remember this if u dont know whether its ac or dc,just see if u are supplying the current then its a simple motor and the motor rule applies which is the left hand rule while if u dont supply current and u are producing it then its the dynamo rule which is right hand rule !

was i speaking pashto?

 

[bogus]

was i speaking pashto?

lolz

 

[ashiqbal]

Got my mock papers today
PHYSICS====== P1:38/40=====P2:67/75=====P6:28/30
CHEMISTRY === P1:36/40=====P2:72/75=====P6:29/30
BIOLOGY===== P1:37/40=====P2:73/80=====P6:40/40

 

[farahdar]

Check this link and see if it helps :
http://www.xtremepapers.com/revision/gcse/chemistry/reversible_reactions.php

Thanks

 

[multixamza01]

Thanks

my pleasure

 

[twelveoclock]

Cathode Ray Oscilloscope is a very confusing. Any good notes out there on this topic?