you are studying high energy particles produced by a radioactive decay process. The particles are directed through a region of an electric field and it is found that they do not deflect. The particle could be:
i) An alpha particle ii) A beta-plus particle iii) A beta-minus particle iv) a photon v) a neutrino
a) i
b) i, ii and iii
c) iv
d) v
e) iv and v
Answer: e) iv and v
Their charge is zero.
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