170 Questioning the Universe: Concepts in Physics
everyday world. But remember, there are electronic devices that we probably use every
day that are based on quantum mechanics. To requote Gell-Mann and Feynman, “No
one really understands quantum mechanics.” God does seem to play dice.
13.10 END-OF-CHAPTER GUIDE TO KEY IDEAS
What phenomenon was a concern of the physicists at the end of the nine-•
teenth century? Why?
What was Planck’s idea? How did it differ from what was expected •
classically?
What is the photoelectric effect?•
What was Einstein’s idea to explain the photoelectric effect?•
Why was Einstein’s idea so controversial?•
What are the differences between the particle and wave predictions in the •
photoelectric effect?
What were Boh ...