Question

The average neutrino traveling from the Sun to the Earth, a distance d = 1.5 x 10^8 km, has an energy of Ev = 0.4 MeV. (Billions of such neutrinos stream through every square centimeter on the face of the Earth every second.) Recent experimental evidence suggests these neutrinos have a mass mv = 10^-3 eV/(c^2). In this case, how long does the passage from Sun to Earth take in the (average) neutrino’s rest frame? How long does it take according to observers on Earth?

Answer 1