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AS Physics P1 MCQs Preparation Thread.

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A double slit experiment, using light of wavelength 600 nm, results in fringes being produced on a
screen. The fringe separation is found to be 1.0 mm.
When the distance between the double slits and the viewing screen is increased by 2.0 m, the
fringe separation increases to 3.0 mm.
What is the separation of the double slits producing the fringes?
A 0.4 mm B 0.6 mm C 0.9 mm D 1.2 mm
umar plzz help plzz!
 
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AAAA they are still tilted!!

For 1)
The potential at P and Q is the same (because both points experience the same electric field strength), and when 2 points have the same potential no work is done between them. Therefore the answer is A.

For 2), The parallel combination is getting 1/3V and also 1/2 of the total current. Total power loss is therefore 1/6 of the total power. Alternatively, you can use a fake value for the resistance of the resistors (since they are equal) and then calculate the value of the power loss manually. Regardless of the value you use you will get 2W as the answer.
 
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AsSalamoAlaikum Wr Wb!

need help with this plz:
View attachment 12176
Q is not providing a couple as they have mentioned that the lower portion of the belt provides no tension. So we calculate the moment of it instead using the upper tension (don't be confused about torque always relating to a couple, it just means turning effect).

Moment of Q = force * p.d. from the pivot (and p.d from pivot is half of the diameter).
3 = f * 15 mm
f = 60 N

With this, you already have your answer but in case you want to calculate P:

Moment of P = force * p.d. from pivot
= 60 * 75 mm
= 4.5 Nm
 
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AsSalamoAlaikum Wr Wb!

need help with this plz:
View attachment 12174
Force = Pressure / area

If the area is the same, then the force depends on the pressure.

Pressure = ρgh
ρ and g are constant so the pressure depends on the value of 'h'.

At S and Q, 'h' is equal therefore they have the same pressure and same force. At, P and R, 'h' is more for point R therefore the force on P is less than that of R.

So for any point in water, the lower point has more pressure and therefore more force.

So P < R and S = Q. Therefore A is right.

This concept is related to 'floatation'.
 

Jaf

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need help with this plz:
View attachment 12176
The couple produced in Q has forces acting on the upper belt (towards the right) and in the center of the motor (towards the left). The force does not act on the lower belt as the lower belt is slack (which woudl not have been the case if a force was acting on it).
Hence torque by Q = 3.0 Nm = F x (100/2) x 10^-3 [we're halving the diameter because the distance between the two forces is the radius of the motor and not the diameter).
F = 60N
 
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question24.png

the answer is C.but is it cause it's given that the material is same or is there some proper working??
 
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ooookaay am geting da asnwer but y will freq remain da same??
when waves travel, they carry energy. When passing from one media to another the energy content of the waves has to stay the same due to the law of conservation of energy.
we know that E=hf where E=Energy of wave, h=planck's constant, f=frequency of wave.
so h being a constant would not change, and f could not change either.
So, the only characteristic of the wave which can change is the velocity and wavelength, which adjust themselves so as to give the same frequence before and after passing through different media.
 
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