Teaching Modern Physics - QuarkNet - Fermilab

7. J. J. Thompson applied a net force of zero on the cathode rays by applying both an
electric and a magnetic field. As a result, Thompson measured the _______ of the
cathode rays.
a.) charge
b.) mass
8. Fermilab accelerates_________.
a.) electrons
b.) protons
152
c.) charge/mass ratio
d.) speed
c.) neutrinos
d.) neutrons
9. Determine the direction of the magnetic field required to cause the proton beam to move
counterclockwise in a circular path as shown.
a.) into the page
b.) out of the page
c.) toward the top of the page
d.) toward the bottom of the page
10. Three particles have identical charges and speeds. They enter a constant magnetic field
and follow the paths shown in the picture. Which particle is the most massive?
a.) 1 b.) 2 c.) 3