Today let’s consider the neutrino a

Today let’s consider the neutrino and the resolves of some experiments down in the 1995 at the Los Alamos national laboratory in New Mexico, which bear on the neutrino. These resolves suggest that this little particle does indeed have mass that tiny bet to be sure but measurable by the very sensitive instruments of that lab. The neutrino’s origin has always been an interesting case, though a case not unusual in the history of physics. As you know, ordinarily scientific observation precedes scientific theory. Ocean tides were observed, ocean tides were explained; gravity is observed, gravity is explained. However, let’s consider what happened in the neutrino’s case. When the neutrino was proposed over sixty years ago, it was a convenient fiction. Scientists had not observed such a particle nor even as a fact. So what let them to conceive of this imaginary object? They had been writing equations about neutron decay in which the energy amounts on each side of their equations were unequal. In order to keep this energy amounts the same on both sides of the equations, they added little particle named neutrino and gave it precisely enough energy to balance the equations and the loan be hold years later. About thirty-five years ago real neutrinos were found. Now we have the more recent developments. Originally, the neutrino was thought not to have any mass at all. But Los Alamos experiments seem to disprove this premise. They indicated that neutrinos do have mass—about onemillionth
the mass
of electron.



39.why
did the
speaker
mentions
the ocean
tides
and
gravity?

40.how
did the concept
of
neutrino
originate?

41.what
did
the experimental
results
at
Los
Alamos
show about
the
neutrino?