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Sagot :

SCOLADAN

Bonjour,

λ = 1.10⁻⁶ m et E(impulsion) = 0,1.10⁻⁶ J

1) ν = c/λ = 3.10⁸/1.10⁻⁶ = 3.10¹⁴ Hz soit 300 THz

2) infrarouge

3) E = h x ν = 6,63.10⁻³⁴ x 3.10¹⁴ ≈ 2.10⁻¹⁹ J

4) n = E(impulsion)/E = 0,1.10⁻⁶/2.10⁻¹⁹ ≈ 5.10¹¹ photons

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