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## Main Question or Discussion Point

can any one tell me the difference between classical mechanics and quantum mechanics??

- Thread starter shankar
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can any one tell me the difference between classical mechanics and quantum mechanics??

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pmb

Roughly - Classical mechanics deals with quantities on a macroscopic scale and quantum mechanics deals with quantities on a sub atomic scale.Originally posted by shankar

can any one tell me the difference between classical mechanics and quantum mechanics??

Classical mechanics use the idea that a particle is at a particular place at a given time and thus uses the concept of a trajectory. Quantum mechanics deals only with probabilities of where a partilce will be found, the momentum and energy it will have etc.

Pete

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Chi Meson

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For example, in quantum mechanics, you would be interested in what happens to a single neutron. Depending on the condition, there are various probabilities to the outcomes (80% likely to do this, 20% likely to do that).

When you have billions of billions of billions of particles, the most probable things seem dominant and the least probable things go unnoticed {WARNING: QUANTUM OVERSIMPLIFICATION} Who cares if a few of your electrons suddenly "tunnel" into the next galaxy. THere goes one right now! But you're fine, because most of the rest did what we expected them to do.

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christench

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Er... no. A key conclusion of QM is that waves and particles are just different sides of the same coin. Mathematically, Schrodinger wave equations are ultimately equivalent to quantum particle equations. The schrodinger equation gets most limelight because it is generally considered as easier, and making more sense.Quantum is all about waves, the dynamics of all things is determined by waves.

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christench

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selfAdjoint

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It is possible to imagine the amplitude is just a mathematical construct, part of a calculating algorithm. But the wave nature is experimentlly visible.

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