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    Question

    In Bohr’s model of the hydrogen atom, electrons in

    “stationary” orbits do not emit radiation continuously because:
    A they are restricted to orbits of specific quantized angular momenta and energies, so they only emit or absorb energy when jumping between these orbits Correct Answer Incorrect Answer
    B the electrons stop moving in those orbits Correct Answer Incorrect Answer
    C the electrostatic attraction is balanced by centrifugal force Correct Answer Incorrect Answer
    D the atom is at absolute zero temperature Correct Answer Incorrect Answer

    Solution

    In Bohr’s model of the hydrogen atom, electrons in stationary orbits do not emit radiation continuously because they are restricted to certain discrete orbits where their angular momenta are quantized. In these orbits, electrons have definite, quantized energies and do not lose energy by radiation while moving in these fixed orbits. Radiation or absorption of energy occurs only when an electron jumps between two stationary states, which explains the discrete spectral lines of hydrogen. Thus, the correct answer is (A) .

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