Phcysics

Question 1

In order to eliminate interference between the electron beam and atoms and molecules in the air,
Thomson created a ______ inside his cathode-ray tube.

Answer 1

Vacuum

Question 2

Thomson
created the electron beam by applying a large _________________________ between the
cathode and the anode.

Answer 2

potential difference

Question 3

The electric field applied perpendicular to the electron beam deflected the beam _________________________ towards the positive plate.

Answer 3

Upward

Question 4

The magnetic field, which was applied
perpendicular to both the electric field and the direction of motion of the electrons, deflected the beam _________________________.

Answer 4

Downward

Question 5

At the end of a cathode-ray tube, the electron beam strikes
a _________________________ which produces a glowing spot.

Answer 5

florescent coating

Question 6

When the forces from the electric field and the magnetic field are equal, the electron beam follows a
_________________________ path.

Answer 6

straight

Question 7

Using known values of E and B, Thomson measured the deflection of the electron beam and was
able to calculate the _________________________ of an electron.

Answer 7

mass

Question 8

The expression v/Br can be used to calculate the _________________________ of an
electron.

Answer 8

charge to mass ratio

Question 9

In a cathode ray tube, particles called _________________________ are deflected in a
direction opposite that of electrons.

Answer 9

Protons

Question 10

Forces applied to the electron beam by the electric field and the magnetic field are
balanced only for electrons with a specific _________________________

Answer 10

Velocity