ch44-p044 - 44. (a) We substitute = (2898 mK)/T into the...

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44. (a) We substitute λ = (2898 µ m·K)/ T into the expression: E = / hc λ = (1240 eV·nm)/ λ . First, we convert units: 2898 m·K = 2.898 × 10 6 nm·K and 1240 eV·nm = 1.240 × 10 –3 MeV·nm. Thus, E T T = ×⋅ 1240 10 2 898 10 428 10 3 6 10 . . .. MeV nm nm K MeV K ch (b) The minimum energy required to create an electron-positron pair is twice the rest
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