The force needed to make an object move in a circle is
a. centripetal force
b. weight
c. kinetic friction
d. static friction
e. none of the above
[Ques. 2] Which of these behaves most similarly to electrons in the Feynman experiments?
a. atoms
b. atomic nuclei
c. protons
d. photons
e. bullets
[Ques. 3] The SI units of acceleration are
a. mi/h
b. km/h
c. m/s
d. m/s2
e. none of the above
[Ques. 4] When Feynman's two-slit thought experiment is repeated with electrons instead of bullets and water waves, what happens?
a. With one slit open, electrons behave like waves, but with two slits open, they behave like particles.
b. Electrons behave like waves, confirming deBroglie's theory.
c. Electrons behave like particles, confirming the Bohr model of the atom.
d. The electrons act sometimes like waves and sometimes like particles, in no predictable way.
e. With one slit open, electrons behave like particles, but with two slits open, they behave like waves.
[Ques. 5] The SI units of velocity are
a. mi/h
b. km/h
c. m/s2
d. m/s
e. none of the above
[Ques. 6] What was the conclusion of Feynman's first thought experiment regarding waves and particles, in which indestructible bullets are fired from a wobbly gun at a pair of slits?
a. When both slits are open, the total of bullets in this sand is the sum of bullets shot through one slit and the other.
b. A bullet through one slit affects the probability that the next bullet goes through the same slit.
c. Bullets rebounding from closed slits show refraction patterns.
d. When both slits are open, interference patterns keep the number of bullets from reaching the full number shot one slit and then the other.
e. Three times as many bullets go through two open slits as through one and then the other.
[Ques. 7] An example of an action at a distance force is
a. tension
b. weight
c. static friction
d. kinetic friction
e. none of the above
[Ques. 8] What was one of the early experimental confirmations of deBroglie's theory that electrons behave like waves?
a. Niels Bohr's quantitative work with electron orbits in hydrogen atoms.
b. Albert Einstein's confirmation that deBroglie's work was sound.
c. The discovery of diffraction effects in electron scattering.
d. Young's experiments on double slit interference.
e. The discovery of varying brightness in spectral signatures.
[Ques. 9] The acceleration of a body is
a. always in the same direction as its velocity
b. always in the same direction as the net force on the body
c. in the direction that the body is moving
d. equal to the net force on the body
e. none of the above
[Ques. 10] What was deBroglie's revolutionary idea about atomic structure?
a. Electrons orbit a nucleus.
b. The atom is like a plum pudding with electrons stuffed into a positively-charged shell.
c. Photons behave like waves.
d. Electrons behave like waves.
e. It is not possible to specify the position and momentum of a photon both exactly at the same time.
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