Biology; Chemistry; Physics: Post your doubts here!

[asadalam]

For the first one, I don't really know, but it is a principle. I think that since voltage remains the same in a a parallel circuit, the emf to be provided can be divided amongst the batteries.

For the second one, about the filament lamp, it is an 'increasing at a decreasing rate' graph (V plotted on the x-axis ...)
As I increase the voltage, the current in the circuit also increases. However, the temperature increases, which causes more resistance, and ultimately leads to current decreasing



For the thermistor, as the temperature increases the resistance decreases.

When it is hot, the graph will be ' Increasing at a decreasing rate' (I plotted on x-axis)
Basically, less resistance will be occurring in the circuit, so as the current increases, the voltage will at a point become constant. There is little resistance to stop the current

When it is cold, the graph will be the opposite and ...

Alright thanks,what are you studying now by the way?

PS,uff tumhari lehrati hoi zulfain

 

[mohammad ahmed]

what do we have to remember about the electromagnetic waves??

 

[Awesome12]

Alright thanks,what are you studying now by the way?

PS,uff tumhari lehrati hoi zulfain

Physics (Doing MCQs no)

lol

 

[Faizan Muhammmad]

Paper 2 ki tyari book se nahi karni?

first the papers

 

[mohammad ahmed]

1 more Question

1 more Question

1-draw a straiht line at 90 angle from m towards mirror
2-then measure length of line and extend it behind the mirror with dotted line and mark image point
3-then from image draw to lines towards the line P
4where the two lines cut the mirror join that point with M and mark the arroiwns on rays

 

[Muhammad_Hamza]

1-draw a straiht line at 90 angle from m towards mirror
2-then measure length of line and extend it behind the mirror with dotted line and mark image point
3-then from image draw to lines towards the line P
4where the two lines cut the mirror join that point with M and mark the arroiwns on rays

I'm not getting it

 

[Abdul Hanan]

can u explain Abdul Hanan

sorry i'm late

although the diagram is enough you may add this:
place object infront of mirror. image will be at equal distance as object, from mirror. make lines to mirror from object and make lines from image to incident rays drawn to get reflected rays...

 

[mohammad ahmed]

I'm not getting it

iam sorry thats wrong

 

[Muhammad_Hamza]

iam sorry thats wrong

Edit that picture in paint.Please correct it

 

[kirann]

sorry i'm late
View attachment 43021
although the diagram is enough you may add this:
place object infront of mirror. image will be at equal distance as object, from mirror. make lines to mirror from object and make lines from image to incident rays drawn to get reflected rays...

np thanks..

 

[mohammad ahmed]

Edit that picture in paint.Please correct it

put the arrows on them too

 

[kirann]

explain it plz

 

[Muhammad_Hamza]

put the arrows on them too

Thanks man
Ever 1 more Q...
Sahi draw kiya?

 

[DaniyalK]

explain it plz

Calculate the gradient of the straight line and it will give the constant speed (terminal velocity).

 

[mohammad ahmed]

Thanks man
Ever 1 more Q...
Sahi draw kiya?

from my knowledeg it is right.but confimr from others too

 

[DaniyalK]

Thanks man
Ever 1 more Q...
Sahi draw kiya?

Yes

 

[Muhammad_Hamza]

from my knowledeg it is right.but confimr from others too

I think it it correct because Red Light deviates Less than other lights

 

[mohammad ahmed]

I think it it correct because Red Light deviates Less than other lights

yep

 

[DaniyalK]

I think it it correct because Red Light deviates Less than other lights

IIRC it is mentioned in the question that P and Q are the ends of the spectrum. Red is always at the upper end.

 

[Muhammad_Hamza]

IIRC it is mentioned in the question that P and Q are the ends of the spectrum. Red is always at the upper end.

Yes