A hydrogen atom in an n = 2, l = 1, ml = -1 state emits a photon when it decays to an n = 1, l = 0, ml = 0 ground state. In the absence of an external magnetic field, what is the wavelength of this photon?

A hydrogen atom in an n = 2, l = 1, ml = -1 state emits a photon when it decays to an n = 1, l = 0, ml = 0 ground state. In the absence of an external magnetic field, what is the wavelength of this photon?

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Question

A hydrogen atom in an n = 2, l = 1, m_l = -1 state emits a photon when it decays to an n = 1, l = 0, m_l = 0 ground state. In the absence of an external magnetic field, what is the wavelength of this photon?

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