Recent content by Chandra Prayaga

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    Sequences of measurements in quantum mechanics

    Is this question still running? I believe things would be clearer if standard symbols with superscripts and subscripts are used. As far as I can see, the problem is the following: The Hamiltonian is: H = ω0Sz The state of the system is, for example: (1/√10) |+> + (3/√10) |->, where the states...
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    Traveling proton and electric field problem

    All uncertainties of negative signs are removed by drawing a picture. Draw the diagram with the x axis, show the proton moving to the right (in the + x direction). Now ask the question, what direction should the force be to stop the proton? That will also give the direction of the electric...
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    Determine the velocity of a particle in mass spectrometry

    A diagram would help in understanding what the symbols and the formulae mean. I am not sure where the second formula Ec(f) = Ec(i) - Ec(f), comes from.
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    Minimum average value of position

    As PeroK pointed out, your expression for <x> is wrong. Also note that there is a difference between differentiating <x> and differentiating either ϕ(x) or its square which is the probability density: The probability density is a function of x, whereas <x> is not. <x> is a definite integral...
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    Correct statement regarding a conductor in a magnetic field

    I frankly don't understand the need for "Fleming's left hand rule". This is indeed the Hall effect, and everything is explained by the lorentz force law, which uses the standard right hand rule for all cross products of vectors. I think an extra rule for particular cases (such as the electron)...
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    Understand a Conceptual question on Scattering

    What was your reason behind your choice?
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    I don't know how I got "mysterious energy" in a Carnot heat pump

    Did you use the information that it is a Carnot cycle?
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    Conservation of energy / work problem

    There was nothing wrong in what you worked out. As haruspex pointed out, identify yi and yf in your own algebra and you are done.
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    Set up the differential equation showing the voltage V(t) for this RC circuit

    Check your derivative dV/dt again.
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    What do the symbols in the gas equation represent?

    Incidentally, the letters p, V, n, R and T are called "symbols" which stand for "variables". Your identification of symbols with variables was correct.
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    Calculations using the Ideal Gas Law

    In your ideal gas equation pV = nRT all the quantities are given, except n. So solve for n. That is the first step. Now to nswer (ii), you need to know how many atoms thyere are in one mole of the ideal gas. Do you know that?
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    Electrical field outside a hollow spherical conductor

    There are a couple of steps in the logic before you can come to a conclusion. First you should make a drawing of the field lines or arrows inside the hollow, keeping in mind that the electric field is perpendicular to the surface of the conductor.
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    Electrical field outside a hollow spherical conductor

    Remember that the electric field must be perpendicular to the metallic surface, in equilibrium. That will be so inside the hollow too.
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    Electrical field outside a hollow spherical conductor

    Let us look at your question step-by-step. Place the metal spherical hollow conductor in a uniform electric field inside a capacitor. If the elctric field penetrated into the hollow region, what would be the shape of the electric field lines inside the hollow?
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    Calculate Net Electric Field at Point P | Two Charges 42cm Apart

    Also draw the arrows in the diagram showing the fields that you want to calculate.