Feynman Lectures
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Transcript of Feynman Lectures
Feynman Lectures on Physics
Who Is Feynman?
Born: – 11th May 1918– Far Rockaway, Queens, NY
College:– MIT– Princeton– Cornell (braved a snow-
storm here !)– Caltech
Work– Los Alamos
Feynman’s Works
Feynman Lectures – Caltech The “Unconventional” approach Other works
– QED– The Character of the Physical Law– Surely You’re Joking Mr. Feynman !
Quantum Mechanics as Physics Not Philosophy
Feynman’s views on the subject– Philosophy does not contribute to “advance” – A “working” method– The “Observer” issue– Typical Feynman
Quantum Behavior: The Interference Pattern (Bullets)
The Interference Pattern (waves)
The Interference Pattern (electrons)
The Interference Pattern (electrons when observed !!)
The Quantum BIZARRE
“It is impossible to design an apparatus to determine which hole the electron passes through that will not at the same time disturb the electrons enough to destroy the interference pattern” – Heisenberg (says Feynman in his lecture)
“Logical tight-rope” walking
Quantum Mechanics Principles
2P P = Probability Ф = Amplitude
i
i
Uncertainty
Special Case: If one knows the momentum of a particle to an uncertainty of Δp, then she/he cannot at the same time know the position more accurately than Δx = h/Δp
Uncertainty Principle “protects” quantum mechanics
Experimental setup demo for UP
One Example of UP
B
ppp oo
The Size of the Atom
Spread in momentum = h/a• a is like radius
Momentum must be of order p ~ h/a
Kinetic Energy =
Total Energy =
2
222
222
1
ma
h
m
pmv
a
e
ma
h
0
2
2
2
42
The Size of the Atom
The “Philozophigal” implications
Disturbance is necessary for consistence of the viewpoint
Was sound made ? Vs. Was there a sensation of sound ? – The role of a conscious observer in a forest/physics?
“No measure” implies “No speak” is a false implication
The basis of a science is its ability to predict
Feynman Lectures on Physics
-A rather short introductionBy Srinivasa
Thank you all!!