Recent content by Ezequiel

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    What can we say about neutron stars?

    Thank you, that's all the confirmation I needed. English is not my native language, so I apologize if I sounded rude and I misinterpreted Simon's post.
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    What can we say about neutron stars?

    What do you mean I cannot ask for confirmation? Of course I can. Do you think that if I had notes on this I'd be asking here? After a couple hours of reading on the internet about a topic I'm not very familiar with, I was pretty sure the correct answer is c), but I was hoping someone more...
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    What can we say about neutron stars?

    Homework Statement About neutron stars we can say that: a) They are newborn stars b) They are generated when a Solar-type star dies c) They are generated when a very massive star dies d) They are in the main sequence Homework Equations None. The Attempt at a Solution I'm...
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    Orbital angular momentum possible values of an electron in a hydrogen atom

    Thank you again :)
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    Pauli exclusion principle and fermions, bosons and quarks

    Thanks!
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    Energy uncertainty of an atom in an excited state

    Could it be \Delta E > \frac{\hbar}{2} \frac{1}{\Delta t} = 32.96 \times 10^{-28}J ?
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    Energy uncertainty of an atom in an excited state

    I just don't know how to use that to solve the problem. Could you be more specific?
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    Energy uncertainty of an atom in an excited state

    Homework Statement A Na atom is in an excited state for a mean time of 1.6 \times 10^{-8}s. Then it jumps to the ground state emitting a photon with 2.105 eV of energy. Find the energy uncertainty of that excited state. Homework Equations The Attempt at a Solution I don't even...
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    Orbital angular momentum possible values of an electron in a hydrogen atom

    Homework Statement What are the orbital angular momentum possible values for an electron in a hydrogen atom with a principal quantum number n = 3? Homework Equations L = \sqrt{l(l+1)}\hbar The Attempt at a Solution Possible values for l are 0, 1, 2. So, substituting these in...
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    Electron in a one-dimensional box emitting a photon

    Thanks!
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    Electron in a one-dimensional box emitting a photon

    Homework Statement An electron in a one-dimensional box emits a photon when it moves from energy level E4 to E2. Find the wavelength of the emitted photon. Length of the box L = 0.300 nm Homework Equations En = n2E1 E1 = \frac{h^2}{8mL^2} λ = \frac{hc}{E_i - E_f} The Attempt at a Solution...
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    Threshold frequency and wavelength of electrons in the photoelectric effect

    Ok, so it would be λ = \frac{hc}{\sqrt{2mc^2K}} \approx 2 nm, right?
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    Pauli exclusion principle and fermions, bosons and quarks

    Homework Statement Which of these particles don't follow Pauli exclusion principle and thus have a symmetric wave function? a) Bosons b) Fermions c) Quarks d) All particles follow Pauli exclusion principle Homework Equations None. The Attempt at a Solution I think that...
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    Threshold frequency and wavelength of electrons in the photoelectric effect

    Thanks for the confirmation. As I understand the photoelectric effect, one photon transfers all of its energy to an electron, so the energy absorbed by any electron must be the same (for a monochromatic beam), in this case hc/(500 nm) = 2.48 eV. Electrons need at least 2.1 eV to escape this...
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    Wavelength of scattered photon and angle of scattering in the Compton scattering

    Homework Statement In the Compton scattering, a photon of wavelength λ collides with an electron at rest, and a new photon of wavelength λ' emerges at an angle θ. Find λ' y θ. Energy of incident photon Ei = 1 MeV Energy of scattered electron Ee = 0.32 MeV Homework Equations E =...