Classical Mechanics vs. Quantum Mechanics

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Presentation transcript:

Classical Mechanics vs. Quantum Mechanics Integrated Science II

Realms of Modern Physics

Classical Physics Mechanics Kinetic Energy – Energy associated with the motion of an object Non-relativistic kinetic energy SI Units of Energy: J (Joules) 1 J = 1 Linear Momentum – Product of an object’s mass and velocity Non-relativistic momentum SI Units of Momentum: kg*m/s

Classical Physics In classical mechanics, the energy values are _________________. Example: Consider the kinetic energy of a baseball that has mass m and which has been thrown with speed v. Question – What are the possible kinetic energy values that the ball can have? Question – Is it possible to know both the speed of the ball and its location simultaneously?

Quantum Physics Example 1: Hydrogen Atom In quantum mechanics, the energy values are _________________. Energy levels for the electron: Hydrogen Atom (Bohr Model)

Hydrogen Atom The hydrogen atom can only absorb or emit energy at discrete energy levels too!

-Hydrogen spectrum lines correspond to differences in energy -Electromagnetic radiation (light) is emitted or absorbed as the electron transitions from an initial n value to a final n value -The energy of the light emitted or absorbed corresponds to the difference in the energy levels

Spectra can be used as a means to identify chemical elements. This is how we know what elements are present in the composition of distant astronomical bodies!

Absorption spectrum of _________________