an electron and a position both of rest energy 0.511 MeVslowly drift together an

Question

an electron and a position both of rest energy 0.511 MeVslowly drift together and annihilate into two gamma ray photons.WHat is the wavelength of each of the photons? (h= 6.63x10^-34j-s,c= 3.00x10^8 m/s, and 1 ev= 1.60x10^-19 J) a. 1.21e-12m b. 2.43e-12m c.4.86e-12m 9.72e-12m an electron and a position both of rest energy 0.511 MeVslowly drift together and annihilate into two gamma ray photons.WHat is the wavelength of each of the photons? (h= 6.63x10^-34j-s,c= 3.00x10^8 m/s, and 1 ev= 1.60x10^-19 J) a. 1.21e-12m b. 2.43e-12m c.4.86e-12m 9.72e-12m

Explanation / Answer

conservation of energy : 2*E = 2*hf = 2*hc/ => = hc/E = 6.63x10^-34*3x10^9/(0.511x10^6*1.6x10^-19) = 2.432x10^-12 => answer b

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