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## Homework Equations

electron volt = 1.602e-19 J

pc = 3.086e16 m

## The Attempt at a Solution

Answer says: 2.6e45 J

I can't seem to get the answer... :(

any help will be appreciated :)

i was thinking since flux falls off ~ 1/d².

so i tried E = flux *d²*avg energy of neutrino

1.3e14*(50000*3.086e16)²*4.2e6*1.602e-19

=3.258e44 J.

So i'm off by more than a factor of 10... :(

What am i doing wrong??