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conantee
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« on: December 31, 2009, 07:31:11 AM »

16. Except for mass, the properties of the muon most cloesly resemble the properties of the
(A) electron
(B) graviton
(C) photon
(D) pion
(E) proton
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conantee
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« Reply #1 on: December 31, 2009, 07:41:07 AM »

With little knowledge of elementary particles, one may guess the property of muon. Since muon is not force-mediated particles (photon for electromagnetics, graviton for gravity, mesons (e.g. pion) for strong force, W and Z bosons for weak force), (B), (C), (D) can be eliminated.

Well, with more guess, proton is not quite elementary since it composed of quarks, the only proton-like particle we have known is neutron. So, (E) is less likely to be the answer.

The correct answer is (A). 48 of 100 people got the right answer.

Physics behind it: muon is categorized as lepton along with electron, tauon and neutrino. Moreover, it has same charge and spin as electron. (You should be familiar with its name when you learn how its decay justifies time dilation predicted the special relativity theory.)
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