Particle
Expression
Mass (amu)
Charge
Property
Proton
p
1.007277
+1
Neutron
n
1.008665
0
Electron
e- or β-
0.000548
-1
Positron
e+ orβ+
Photon or γ-ray
Hνorγ
Neutrino
νe
1/1800 me
νe + p+ → n +β+
Mu-mesons
↓
μ+
207 me
μ+ → e+ + 2νe
μ-
μ- → e+ + 2νe
Mean life = 2.15×10-6 sec
Pi-mesons
π+
273 me
π+ →μ+ +νe
π-
π- →μ- +νe
π0
265 me
π0 →hν1 + hν2
Mean life:π+ &π- = 2.5×10-8 sec;π0 = 10-15 sec
33 構成原子的主要基本粒子是質子、中子和電子,下列特性何者為誤? (A)電子..-阿摩線上測驗