Posted by **Kaitlyn** on Sunday, May 4, 2014 at 8:14pm.

I can't seem to figure this out, I know that neutrinos have nonzero mass but I don't know how that can help me figure this out

The mass of a neutrino is

zero.

equal to the mass of a proton.

equal to the mass of an electron.

less than the mass of an electron but its actual value is unknown.

equal to the mass of a neutron

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