Modern Physics PHY 36001

Question 1.

A stream of electrons can produce a diffractive pattern on a screen when scattered through twin slits. But the pattern disappears when we observe which slit the electrons are going through.

       True
       False

Question 2.

In the twin slit experiment, The diffractive pattern remains even when the intensity of the electron beam is reduced so that only a single electron is scattering through the twin slits at any given time.

       True
       False

Question 3.

Heisenberg says it is not possible to ever measure the precise position of an electron.

       True
       False

Question 4.

De Broglie says that the particle's velocity should be related to the de Broglie wave's group velocity.

       True
       False

Question 5.

You say that the first midterm exam was quite reasonable.

       True
       False

Question 1.

It is impossible to detect the wave-like nature of human-sized objects because

      a. reality is governed by the laws of classical physics.
      b. experimental equipment can only measure the particle-like properties of objects.
      c. their associated de Broglie wavelengths are too small.
      d. they move too quickly, much faster than their group velocities.

Question 2.

The wave-nature of an electron can be observed in

      a. the photo-electric effect.
      b. electron diffraction.
      c. electromagnetic radiometers.
      d. a de Broglie chamber.

Question 3.

Heisenberg was

      a. German.
      b. Austrian.
      c. American.
      d. French.