42. 柑橘潰傷病常發生在植株的那一個器官?(A)葉片(B)花(C)根部(D)種子。

1. For a muon with a half lifetime and a mass of 250 , (me: mass of an electron) moving with a speed of v = 0.8 c, calculate the mean lifetime τ0, the traveling distance d measured at rest, during τ0, the relativistic momentum P by the unit of eV/c, the de-Broglie wavelength , the phase velocity , the total energy E and kinetic energy (KE) in the unit of eV. (A) , d = 1519 m, P = 102.2 MeV /c, , KE = 35.86 MeV (B) , d = 1798 m, P = 102.2 MeV/c, , KE = 40.887 MeV (C) d = 1599 m, P = 113.58 MeV /c, , KE = 43.18 Mev (D) d =1599 m, , KE = 85.18 Mev (E) , d =1798 m, , ==3.7475x108m/s

42. 柑橘潰傷病常發生在植株的那一個器官?

(A)葉片

(B)花

(C)根部

(D)種子。

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