1298_Physics ProblemsTechnical Physics

1298_Physics ProblemsTechnical Physics - Chapter 46...

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Chapter 46 639 Additional Problems P46.50 We find the number N of neutrinos: 10 6 6 1 60 10 46 13 J M e V J == × × NN a f ej . N 10 10 58 . neutrinos The intensity at our location is N A N r × × ×× F H G G I K J J 4 41 71 0 1 3 00 10 3 16 10 31 10 2 58 5 2 87 2 14 2 π . . .. . ly ly ms s m e j . The number passing through a body presenting 5000 050 cm m 22 = . is then 15 10 14 14 . × F H G I K J 1 m m 2 2 or ~10 14 . *P46.51 A photon travels the distance from the Large Magellanic Cloud to us in 170 000 years. The hypothetical massive neutrino travels the same distance in 170 000 years plus 10 seconds: cv 170000 10 yr 170000 yr s bg b g =+ v c = + = × = 170000 170000 10 1 11 0 1 1 1 86 10 12 yr yr s s 1.7 10 yr 3.156 10 s yr 57 e j {} . For the neutrino we want to evaluate mc 2 in Em c = γ 2 : mc E E v c 2 2 2 12 2 12 2 12 2 01 1 1 1 86 10 10 1 1 86 10
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