Recent content by izzmach

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    Eigenvalue of lowering operator

    How to prove that eigenvalue of lowering operator is zero?
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    Quantum Mechanics - Induction Method

    Let a be a lowering operator and a† be a raising operator. Prove that a((a†)^n) = n (a†)^(n-1) Professor suggested to use induction method with formula: ((a†)(a) + [a,a†]) (a†)^(n-1) But before start applying induction method, I would like to know where the given formula comes from. Someone...
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    Quantum Mechanics - Lowering Operator

    sorry, i don't quite understand. Mind to explain it?
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    Quantum Mechanics - Lowering Operator

    Homework Statement let A be a lowering operator. Homework Equations Show that A is a derivative respects to raising operator, A†, A=d/dA† The Attempt at a Solution I start by defining a function in term of A†, which is f(A†) and solve it using [A , f(A†)] but i get stuck after that. Can...
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    What does it mean for a charge to be uniformly distributed on a spherical shell?

    Surface current density, K is defined as: K = σv where σ is surface charge density and v is velocity. Given a uniformly charged spherical shell with radius R, spinning at constant angular velocity ω, find the current. So, I start with this formula: dI = K dl dI = σ Rω dl and I placed the...
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    What Is the Difference Between Semi-Infinite and Infinite Wires?

    I am studying magnetic field and I could not distinguish the difference of semi-infinite and infinite wire. Can someone please explain briefly the difference of these two? Thank you.
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    Why Does Iron Have a Higher Molar Specific Heat Than Its Debye Value?

    Why does iron have molar specific heat greater than Debye value 3R?
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