Physics 201, Concepts of Physics
HW #2 due week of Oct 14, 2012

(1) How did Einstein's and Planck's "quantum hypotheses" differ from one another?

(2) What is an ion?
a. The smallest particle of microwaves
b. The smallest particle of Beryllium
c. A charged atom or molecule
d. A component of the atomic nucleus
e. The power switch for an Apple

(3) Suppose that I first shine lamp A on a piece of metal, and then replace it with lamp B.  I find that with lamp B, more electrons are emitted, but the individual electrons travel more slowly than with lamp A.  Which of the following are possible (check all that apply)?
a. Lamp A emits a higher frequency
b. Lamp B emits a higher frequency
c. Lamp A emits more power
d. Lamp B emits more power
e. Lamp A emits more photons per second
f. Lamp B emits more photons per second

(4) Suppose that I use my hand to block the path labelled "i2" in slide 7 of October 9th's lecture.  Will interference be observed?

(5) What do I need to actually do to tell whether or not interference is occurring in a Mach-Zehnder interferometer?  (What do I measure, and what - if anything - do I need to change?)

(6) If two objects, one moving with a constant velocity (metres per second) and the other starts at rest and moves with a constant acceleration (metres per second-squared) travel the same distance in one second, then in two seconds,
a. The one with constant acceleration will travel twice as far as the one moving with constant velocity
b. The one with constant velocity will travel twice as far as the one with constant acceleration
c. The one with constant acceleration will travel four times as far as the one with constant velocity
d. The one with constant velocity will travel four times as far as the one with constant acceleration
e. They will travel the same distance