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    Are De-Broglie stationary orbits different from Bohr's stationary orbits?
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    Historically, de Broglie's suggestion (1923, that electrons could behave as waves), gave an explanation for Bohr's earlier (1913) arbitrary assumption that the angular momentum of the electron was quantised. It explained the allowed energy levels of the electron in terms of "standing waves" where the circumference of the orbit had to be a whole number of wavelengths.
    The theory was later improved by Schrödinger and others.
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    So basically can we say that they both are same
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    They refer ultimately to the same thing (the observed energy levels in hydrogen atoms), but explain it in different ways. Bohr talked about quantized angular momentum, de Broglie talked about waves and wavelength. So yes, so long as you keep it in its historical perspective.
    It very much depends on the level at which you are attempting to answer the question.
    At A Level, if you have studied the Bohr atom, where you think of the electron in an "orbit", then de Broglie's suggestion refers to the same energy levels but explains them in a wave mechanical way rather than a classical way.
    Are you attempting to answer an exam or homework question? If so it would be interesting to know what the question is and which board. The boards usually have a statement in the specification where it will tell you exactly (you hope!) what you need to know.
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    I am an undergraduate student and the question was given like this-What is De Broglie concept of stationary orbits? Are De broglie stationary orbits different from Bohr's stationary orbits?
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    Then it's an open ended question where you need to look at what Bohr was saying, and what he was trying to explain; and then talk about how de Broglie expanded this into a wave mechanical idea. So at your level they are the same in some respects, but different in others. Have you gone on in your course to look at how de Broglie's ideas were then built upon?
    I'm suspect the question is designed to extract from you what the differences and similarities are.
 
 
 
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