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Physics: Post your doubts here!

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help me with this please..

Light passes through a diffraction grating ruled at
1000 lines per cm and the same wavelength of
light also passes through two narrow slits 0.5
mm apart. Both situations produce intensity maxima
and minima on a screen.
Which statement about the separation of the maxima on the screen and the sharpness of the
maxima is correct?
A
The diffraction grating maxima are less widely spaced and are less sharp than the two-slit
maxima.
B
The diffraction grating maxima are less widely spaced and are sharper than the two-slit
maxima.
C
The diffraction grating maxima are more widely spaced and are less sharp than the two-slit
maxima.
D
The diffraction grating maxima are more widely spaced and are sharper than the two-slit
maxima.

i dont get what 'sharper' means and how to prove which is more widely spaced? thanks! ans is d.
 
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But where is the pivot

You just have to take moments about a point. You can take it from any point on the ladder. In this case to get the answer you take it from the highest point of the ladder and apply the formula
clockwise moments = anticlockwise moments
 
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Need help...
A ball is falling at terminal speed in still air. The forces acting on the ball are upthrust, viscous
drag and weight.
What is the order of increasing magnitude of these three forces?

A upthrust → viscous drag → weight
B viscous drag → upthrust → weight
C viscous drag → weight → upthrust
D weight → upthrust → viscous drag

Answer is A. But why?
Thank you ! :D

 
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Need help...
A ball is falling at terminal speed in still air. The forces acting on the ball are upthrust, viscous
drag and weight.
What is the order of increasing magnitude of these three forces?

A upthrust → viscous drag → weight
B viscous drag → upthrust → weight
C viscous drag → weight → upthrust
D weight → upthrust → viscous drag

Answer is A. But why?
Thank you ! :D
The upthrust will be the lowest because the force from the atmosphere pushing you upwards is the least as the atmosphere is very thin. The weight will be the greatest because it is the force that is making you fall down .
 
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Can someone explain Q 33 May June 2006 P1. I am not understanding how it will be a potential divider circuit and how to solve it.
 
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CORRECT ME IF I AM WRONG.....Untitled.png the answer to this question is C because we have to take the perpendicular distances between the slopes.......RIGHT?
 
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