Physics: Post your doubts here!

[nehaoscar]

How A?
Nsina = ny (y = lamda)
sina/y = n/N right??
But then how Nn?

 

[princess Anu]

View attachment 54361
Why not D?

Steel is an alloy, so has to be less ductile than pure metals

 

[nehaoscar]

How C?
E = FL/Ax
E = 2L/(A/4)
E = 8x more ??

 

[nehaoscar]

How D?

 

[nehaoscar]

How B?

 

[nehaoscar]

I know the answer is C but which states do A B and D represent?

 

[nehaoscar]

Why B?

 

[nehaoscar]

Why not D?

 

[nehaoscar]

Why not B? and Why D?

 

[nehaoscar]

Why C?

 

[nehaoscar]

Why C?

 

[amal sharkawi]

CAN ANYONE PLZ ANSWER????
WHY IS IT B????

 

[amal sharkawi]

View attachment 54373
Why C?

Li is solid that is why it will be the lowest speed
rest r liquid or gas

 

[amal sharkawi]

can anyone answe plzzz??

 

[Mathemagical]

View attachment 54373
Why C?

Li is solid that is why it will be the lowest speed
rest r liquid or gas

No, it has nothing to do with that. The element with the greatest mass to charge ratio has the lowest speed.

 

[Mathemagical]

View attachment 54376

can anyone answe plzzz??

Power equals to the square of current multiplied by the resistance. Use this formula to work out the ratio.

 

[amal sharkawi]

Power equals to the square of current multiplied by the resistance. Use this formula to work out the ratio.

I DID BUT IT DOESN'T WORK

 

[amal sharkawi]

see 476 at
http://physics-ref.blogspot.com/2015/03/physics-9702-doubts-help-page-92.html

THANX

 

[Mathemagical]

View attachment 54371
Why not B? and Why D?

There is no such thing as a transverse sound wave. All sound waves are longitudinal.

 

[Mathemagical]

View attachment 54371
Why not B? and Why D?