Question 10

Shown is an apparatus for studying the properties of electrons. Electrons from an emitter F pass through a hole in G and then move into a region where crossed electric (L) and magnetic (M) fields are applied. The spacing between the electric field plates at L is 1 mm. Various target materials can be placed at W. The electrons are detected at a phosphor coated screen labeled x-y. One scale unit on the screen equals 1 cm.

Suppose the crossed electric and magnetic fields are not present so that the electron beam hits point (0,0) on the screen.

Another target is now placed at W. From the pattern produced on the screen (shown below; once again black is the absence of light) one can conclude that

A. an interference pattern was obtained by passing the electrons through a double slit.
B. an interference pattern was obtained by the electrons passing through a metal foil.
C. a diffraction pattern was obtained by electrons passing through a small circular opening.
D. a diffraction pattern was obtained by electrons passing near the straight edge of an object.
E. a diffraction pattern was obtained by electrons passing through a crystal like NaCl.

Answer

Formula Sheets
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