*P69306A0328*
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PMT
Questions 4 and 5 refer to the information below.
A demonstration is carried out using a beam of electrons in an evacuated tube.
When electrons hit a fluorescent screen, light is emitted. A piece of metal, in the shape of a
Maltese cross, stops electrons and produces a shadow on the screen as shown.
fluorescent screen Maltese cross
source of electrons
X