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what's the maximum energy of electrons that 20cm of selenium can block?

Input interpretation

kinetic energy of particle |  incident particle | e^- (electron) radiation absorber | red selenium thickness | 20 cm
kinetic energy of particle | incident particle | e^- (electron) radiation absorber | red selenium thickness | 20 cm

Result

14 GeV (gigaelectronvolts)
14 GeV (gigaelectronvolts)

Comparison as energy for 14 GeV

 ≈ ( 0.15 ≈ 1/7 ) × mass-energy equivalent of a Z boson ( ≈ 1.5×10^-8 J )
≈ ( 0.15 ≈ 1/7 ) × mass-energy equivalent of a Z boson ( ≈ 1.5×10^-8 J )
 ≈ ( 0.18 ≈ 1/6 ) × mass-energy equivalent of a W boson ( ≈ 1.3×10^-8 J )
≈ ( 0.18 ≈ 1/6 ) × mass-energy equivalent of a W boson ( ≈ 1.3×10^-8 J )
 ≈ 0.29 × initial per beam operating energy of the CERN Large Electron Positron Collider in 1983 ( ≈ 8×10^-9 J )
≈ 0.29 × initial per beam operating energy of the CERN Large Electron Positron Collider in 1983 ( ≈ 8×10^-9 J )

Comparison as kinetic energy for 14 GeV

 ≈ ( 0.014 ≈ 1/70 ) × approximate kinetic energy of a flying mosquito ( ≈ 1.6×10^-7 J )
≈ ( 0.014 ≈ 1/70 ) × approximate kinetic energy of a flying mosquito ( ≈ 1.6×10^-7 J )

Absorber material properties

〈Z/A〉 | 0.4305 nuclear collision length (λ_T) | 88.7 g/cm^2 nuclear interaction length (λ_I) | 146.7 g/cm^2 radiation length (X_0) | 11.91 g/cm^2 minimum ionization (- dE/ dx |_ min) | 1.343 MeV/(g/cm^2) density | 4.39 g/cm^3 Molière radius | 14.57 g/cm^2 pion collision length | 113.5 g/cm^2 pion interaction length | 175 g/cm^2 plasma energy | 40.11 eV
〈Z/A〉 | 0.4305 nuclear collision length (λ_T) | 88.7 g/cm^2 nuclear interaction length (λ_I) | 146.7 g/cm^2 radiation length (X_0) | 11.91 g/cm^2 minimum ionization (- dE/ dx |_ min) | 1.343 MeV/(g/cm^2) density | 4.39 g/cm^3 Molière radius | 14.57 g/cm^2 pion collision length | 113.5 g/cm^2 pion interaction length | 175 g/cm^2 plasma energy | 40.11 eV