p44_045 - of neutrinos intercepted by that area(very small...

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45. (a) Since two neutrinos are produced per proton-proton cycle (see Eq. 44-10 or Fig. 44-11), the rate of neutrino production R ν satis±es R ν = 2 P Q = 2(3 . 9 × 10 26 W) (26 . 7 MeV)(1 . 6 × 10 13 J / MeV) =1 . 8 × 10 38 s 1 . (b) Let d es be the Earth to Sun distance, and R be the radius of Earth (see Appendix C). Earth represents a small cross section in the “sky” as viewed by a ±ctitious observer on the Sun. The rate
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Unformatted text preview: of neutrinos intercepted by that area (very small, relative to the area of the full “sky”) is R ν, Earth = R ν µ πR 2 e 4 πd 2 es ¶ = (1 . 8 × 10 38 s − 1 ) 4 µ 6 . 4 × 10 6 m 1 . 5 × 10 11 m ¶ 2 = 8 . 2 × 10 28 s − 1 ....
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