1. Classical Mechanics vs. Quantum Mechanics
Integrated Science II

2. Realms of Modern Physics

3. 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

4. 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?

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

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

7. -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

8. 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!

9. Absorption spectrum of _________________