ɔnðɪ ˈʌðɚ hˈænd, ɪf ðə nuːtɹˈiːnoʊ hɐz mˈæs, ðˈɛn ɪt mˈʌst ˈɔːlweɪz kˈæɹi ɐwˈeɪ æt lˈiːst ðɪ ɐmˈaʊnt ʌv ˈɛnɚdʒi ɪkwˈɪvələnt tʊ ɪts mˈæs bˈaɪ , ænd ðɪ ᵻlˈɛktɹɑːn spˈɛktɹəm ʃˌʊd dɹˈɑːp ˈɔf ʃˈɔːɹt ʌvðə tˈoʊɾəl ˈɛnɚdʒi lˈɪmɪt ænd hæv ɐ dˈɪfɹənt ʃˈeɪp.
On the other hand, if the neutrino has mass, then it must always carry away at least the amount of energy equivalent to its mass by , and the electron spectrum should drop off short of the total energy limit and have a different shape.