CHEM 322 EXAM 1
No constraints on... - correct answer-1. Energy something may have
2. How fast something may go
In Quantum mechanics for atomic and molecular systems - correct answer-These can have
only certain specific "quantized" systems
If you know the initial position x(o) and the momentum p, then you can calculate - correct
answer-the position of the particle at any time
If a constant force F acts on a particle, we can always calculate - correct answer-its
momentum p and thus its position
Why are we NOT content with classical mechanics - correct answer-There are problems at
the atomic and molecular level
Semi-Historical Approach:
1. Atomic Spectra
2. Photoelectric Effect
3. Compton Effect
4. Davisson - Germer Experiment
5. "Black-Body" Radiation
6. Heat Capacities
Atomic Spectra - correct answer-•Light is emitted or absorbed by individual atoms
•Discrete spectral lines were observed for various atoms
•Each specific type of atom would emit or absorb light only at certain unique frequencies
•This shows that "transitions occur b/w distinct energy states (instead of arbitrary states).
These spectra were involved with the energies of individual electrons.
•Each energy change is associated with a specific photon ("light particle") of energy hv.
Photoelectric Effect:
A. Simple view of experiment
B. Observations
C. Explanation - correct answer-A. Light sines on metal, electron is emitted
B. Observations
• No electron is emitted unless the frequency exceeds a threshold value
• The kinetic energy of the emitted electron is directly proportional to the frequency of light
• The intensity of light can not be used to turn on (or off) electrons; only frequency does
No constraints on... - correct answer-1. Energy something may have
2. How fast something may go
In Quantum mechanics for atomic and molecular systems - correct answer-These can have
only certain specific "quantized" systems
If you know the initial position x(o) and the momentum p, then you can calculate - correct
answer-the position of the particle at any time
If a constant force F acts on a particle, we can always calculate - correct answer-its
momentum p and thus its position
Why are we NOT content with classical mechanics - correct answer-There are problems at
the atomic and molecular level
Semi-Historical Approach:
1. Atomic Spectra
2. Photoelectric Effect
3. Compton Effect
4. Davisson - Germer Experiment
5. "Black-Body" Radiation
6. Heat Capacities
Atomic Spectra - correct answer-•Light is emitted or absorbed by individual atoms
•Discrete spectral lines were observed for various atoms
•Each specific type of atom would emit or absorb light only at certain unique frequencies
•This shows that "transitions occur b/w distinct energy states (instead of arbitrary states).
These spectra were involved with the energies of individual electrons.
•Each energy change is associated with a specific photon ("light particle") of energy hv.
Photoelectric Effect:
A. Simple view of experiment
B. Observations
C. Explanation - correct answer-A. Light sines on metal, electron is emitted
B. Observations
• No electron is emitted unless the frequency exceeds a threshold value
• The kinetic energy of the emitted electron is directly proportional to the frequency of light
• The intensity of light can not be used to turn on (or off) electrons; only frequency does
